《情態(tài)動(dòng)詞class》PPT課件.ppt
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1、目錄,Step 1 概念理解,1.情態(tài)動(dòng)詞用來(lái)表示說(shuō)話人對(duì)一個(gè)動(dòng)作或狀態(tài)的看法、 ,即:說(shuō)話人認(rèn)為某事“可能”,“_”,“應(yīng)該”或是“ _ ”發(fā)生等。 2. 情態(tài)動(dòng)詞 除 ought 和 have 外,后面只能接 的不定式,即動(dòng)詞原形。 3. 情態(tài)動(dòng)詞沒(méi)有 和 的變化,即情態(tài)動(dòng)詞第三人稱單數(shù)不加-s (have to除外)。,態(tài)度,或許,應(yīng)該,不帶to,人稱,數(shù),Step 2,can和could 講解/總結(jié),may和might 講解/總結(jié),will和would 講解/總結(jié),shall和should 講解/總結(jié),must和have to講解/總結(jié),1.can和could,1) 他會(huì)說(shuō)英語(yǔ)和法語(yǔ)。
2、 He could speak French when he was only ten. 歸納:can和could一般翻譯成“ ”,表示能力。 2) Anybody can make mistakes. 歸納:can可翻譯成“ ”,表示客觀可能性。 3) You can /may sit here. 歸納:can和may譯成“ ”,這時(shí),can和may的意思基本相同, can多用于口語(yǔ)。,He can speak both English and French.,他十歲時(shí)就會(huì)說(shuō)法語(yǔ)。,能、會(huì),任何人都可能犯錯(cuò)誤。,可能,可以,1.can和could,4) 那不可能是湯姆,他兩周前就去倫敦了。
3、She cant be working at this hour. 歸納:can用在 句或疑問(wèn)句中,譯成“ _ _ ”,表示驚訝、懷疑、猜測(cè)、或不相信等語(yǔ)氣。,That cant be Tom. He went to London two weeks ago.,這個(gè)時(shí)候,她不可能在工作。,他現(xiàn)在可能在教室么?,不可能/可能,否定, Can he be in the classroom now?,1. can和could,總結(jié):,1.can和could一般翻譯成“ 能、會(huì) ”,表示能力。,2.can可翻譯成“ 可能 ”,表示客觀可能性。,3.can和may譯成“ 可以 ”,這時(shí),can和may的
4、意思基本相同, can多用于口語(yǔ)。,4.can用在 否定 句或疑問(wèn)句中,譯成“ 不可能 ”,表示驚訝、懷疑、猜測(cè)、或不相信等語(yǔ)氣。,5. 表示請(qǐng)求。 eg. Can I have a look at your new book? Can you lend me some money?,could 語(yǔ)氣比can更加委婉。肯定答語(yǔ)可用can 不可用could. eg. - Could I sit here? -Yes ,you can.,表示過(guò)去的可能或許可 eg. At that time we thought the news couldnt be true. Teacher told him
5、 that he could leave . 表示現(xiàn)在的可能性,可能性比can小。 eg. They couldnt come here today because it is raining heavily.,1. No one _ be compared(比較) with Yao Ming in playing basketball. Oh, you are really his big fan. (2011湖南) Acan Bneed Cmust Dmight 2. It _ be the postman(郵遞員) at the door. Its only six oclock. (2
6、011江西高考) Amustnt Bcant Cwont Dneednt,3. The police still havent found the lost child, but theyre doing all they _. (2011四川高考) Acan Bmay Cmust Dshould 4. May I look at your pictures? Yes,of course you _.2009,湖北 A.could B.can C.will D.might 5. Will you stay for lunch? Sorry, . My brother is coming to
7、see me. A. I mustnt B. I cant C. I neednt D. I wont,2. may和might,1)May I leave now? Yes, you may. / No, you mustnt. 你可以用我的自行車。 歸納:may一般翻譯成“ _ ”,表示請(qǐng)求或 _ 。 2)她明天可能來(lái)。 今晚她可能不去參加聚會(huì)了。 歸納:may翻譯成“ 可能 ”,表示說(shuō)話人的猜測(cè),認(rèn)為某一事情“或許”、“可能”發(fā)生。 3)祝你成功! 祝你好運(yùn)! 歸納:may翻譯成“ _”,表示祝愿(這時(shí)一般不用might)。,You may use my bike.,我現(xiàn)在可以走了嗎?,
8、行。/ 不行。,可以,允許,She may come tomorrow.,She may not go to the party tonight.,May you succeed!,May you be lucky!,祝,2. may和might,總結(jié):,1.may一般翻譯成“ 可以 ”,表示請(qǐng)求或 允許 。,2.may翻譯成“ 可能 ”,表示說(shuō)話人的猜測(cè),認(rèn)為某一事情“或許”、“可能”發(fā)生。,3.may翻譯成“ 祝 ”,表示祝愿(這時(shí)一般不用might)。,might,1)表示過(guò)去的可能性或允許。 eg. I thought you might know his address. The p
9、olice agreed that the young man might leave. 2) 表示現(xiàn)在的可能性(可能性比may弱) eg. Your mother might not allow you to do that. The little boy might dislike the present. 3)表請(qǐng)求。只用于疑問(wèn)句或間接疑問(wèn)句中。 eg. Might I have a word with you? I wonder what I might do in this company.,1Some people who dont like to talk much are no
10、t necessarily shy; they _ just be quiet people. (2009安徽高考) Amust Bmay Cshould Dwould 2. The traffic is heavy these days. I _ arrive a bit late, so could you save me a place? (2009遼寧高考) Acan Bmust Cneed Dmight,3. I dont really like James. Why did you invite him? Dont worry. He _ come. He said he wasn
11、t certain(確定) when his plans were. (2011北京卷) A. must not B. need not C. would not D. might not 4. I hear youve got a set of valuable(貴重的) Australian coins._ I have a look? -Yes, certainly. A.Do B.May C.Shall D.Should,3. shall和should,1)我能做些什么來(lái)幫助你呢? Shall he come to see you? 歸納:,shall用于一 、三 人稱的疑問(wèn)句中,譯為
12、“好嗎?或“ _ ”,表示說(shuō)話人征詢對(duì)方的意見(jiàn)或指示/請(qǐng)求允許。 2)He shall go with us. I think you shall do it. 歸納:shall用于 _ 人稱的陳述句中,譯為“必須” 、“應(yīng)該”或“可以”,表示說(shuō)話人警告、命令、威脅等意圖或法律規(guī)定。,What shall I do to help you?,要不要他來(lái)看你?,要不要,他可以和我們?nèi)?,我認(rèn)為你應(yīng)該做。,二、三,3. shall和should,3) 你應(yīng)該照我說(shuō)的去做。 歸納:should譯為“必須, ”。表示“勸告, 建議”或有“責(zé)任,義務(wù)”去做某事。 4) 表示預(yù)料,意為“按理說(shuō)應(yīng)該”(多表
13、示對(duì)將來(lái)的推測(cè),可能性很?。?eg. Its already 7:00 Mr. Smith should arrive. My book should come out next month.,You should do as I told you.,應(yīng)該,3. shall和should,4.should按理說(shuō)應(yīng)該。,1.shall用于一 、三 人稱的疑問(wèn)句中,譯為“好嗎?或“ 要不要 ”,表示說(shuō)話人征詢對(duì)方的意見(jiàn)或指示/請(qǐng)求允許。,2.shall用于二 、三 人稱的陳述句中,譯為“必須” 、“應(yīng)該”或“可以”,表示說(shuō)話人告誡、警告、命令、決心等意圖。,3.should譯為“必須, 應(yīng)該 ”。
14、表示“勸告, 建議”或有“責(zé)任,義務(wù)”去做某事。,5. should也可表惋惜、憂慮、歡樂(lè)、驚訝等感情色彩. Im sorry that you should think so badly of me. To think that it should have happened to me! 誰(shuí)想到這種事竟發(fā)生在我身上!,1. The room is so dirty._ we clean it? Of course. A.Will B.Shall C.Would D.Do 2. You cant imagine that a well-behaved(行為得體的) gentlemen _ b
15、e so rude(粗魯?shù)? to a lady. A.might B.need C.should D.would,3. When can I come for the photos? I need them tomorrow afternoon. They _ be ready by by 12:00. A.can B.should C.might D.need 4. -what does the sign over there read? -“No person _smoke or carry a lighted cigarette,cigar or pipe in this area.”
16、 (2007四川) A will B may C shall D must,5. -I think Ill give Bob a ring . -You_.You havent been in touch with him for ages. (2009江蘇) A will B may C have to D should 9. -Whats the name? -Khulaifi._ I spell that for you?(2010北京) A Shall B Would C Can D Might,4.need,need 作為情態(tài)動(dòng)詞一般用于疑問(wèn)句和否定句,不用于肯定句,過(guò)去式與原型一樣
17、。 1)在否定句中表示“不必” eg. You neednt come if you are busy. We neednt hurry ,for theres plenty of time. 2)在疑問(wèn)句中表示“需要” 肯定回答用must;否定回答用neednt eg. - Need I come tomorrow? -Yes, you must/ No, you neednt. I wonder if(是否) I need bring a camera with me.,need還可以作為實(shí)義動(dòng)詞,表示“需要”后跟名詞、代詞、不定式、動(dòng)名詞等。當(dāng)主語(yǔ)為物時(shí), need to do sth.
18、 eg. All living things need water. I need to get some sleep. need to be do done=need doing The windows need cleaning. =The windows need to be cleaned.,1. I _ worry about my weekendI always have my plans ready before it comes.(上海2011) A. cant B. mustnt C. darent D neednt 2. I want to go to the dentis
19、t(牙科), but you _ with me. A. need to go B. dont need to go C. need not to go D. need go not 3. Must I take a bus ? No, you . You can walk from here. A. must not B. dont C. neednt D. had better not to,5.will和would,1)Will you come to my office? 請(qǐng)你幫我學(xué)習(xí)數(shù)學(xué)好嗎? 歸納:will和would用在疑問(wèn)句中,一般翻譯成“好嗎?”, 表示詢問(wèn)對(duì)方的意愿, 向?qū)?/p>
20、方 。這時(shí),用 比用 更加婉轉(zhuǎn)、禮貌。 2)I will tell you everything I know. 如果你愿意來(lái)參加聚會(huì),我們將非常高興。 歸納:will翻譯成 ,表示“愿意做某事”或“決心做某事”。 3) When I was young I would go swimming in summer and go skating in winter. 歸納:would 表示過(guò)去 動(dòng)作或反復(fù)發(fā)生的動(dòng)作,常含有個(gè)人興趣。 注意:作為情態(tài)動(dòng)詞,will可以用于條件狀語(yǔ)從句。,你到我的辦公室來(lái)好嗎?,Would you please help me with my maths?,提出請(qǐng)求
21、,would will,我愿意把我所知道的一切都告訴你。,If you will come to the party, well be very happy.,愿意,我年輕的時(shí)候,夏天去游泳,冬天去滑雪。,習(xí)慣性的,3.will和would,1.will和would用在疑問(wèn)句中,一般翻譯成“好嗎?”, 表示詢問(wèn)對(duì)方的意愿, 向?qū)Ψ?提出請(qǐng)求 。這時(shí),用 would 比用 will 更加婉轉(zhuǎn)、禮貌。 2.will翻譯成 愿意 ,表示“愿意做某事”或“決心做某事”。 3.would 表示過(guò)去 習(xí)慣性的 動(dòng)作或反復(fù)發(fā)生的動(dòng)作,常含有個(gè)人興趣。 注意:作為情態(tài)動(dòng)詞,will可以用于條件狀語(yǔ)從句。,1.
22、 Write to me when you get home. _. A. I must B. I should C. I will D. I can 2. When he was there, he _ go to that coffee shop around the corner after work everyday. A.would B.should C.had better D.might,3. I often go fishing when I lived in the countryside. A. should B. would C. could D. might 4. If
23、 you _ allow me, I will see you home. A. must B. / C. will D. can 5. -“Tell me the secret.” - “I _.” A. I cant B. I wont C. I coulndt D. I neednt,5. must和have to,1)恐怕我現(xiàn)在必須得走了。 末班車走了,我們只能乘出租車了。 歸納:must譯成“ ” ,用于表示說(shuō)話人的主觀看法,即:說(shuō)話人覺(jué)得自己“必須”或“ ”做某事;have to譯成“ ”,表示外界的客觀情況使說(shuō)話人 去做某事。 2)He has to be there befor
24、e 7 oclock. They will have to get up at 6 oclock. 歸納: 有時(shí)態(tài)和人稱的變化,而must沒(méi)有人稱的變化,只有現(xiàn)在式。,Im afraid I must be leaving now.,The last bus has gone. We have to take a taxi.,必須,應(yīng)當(dāng),不得不,不得不,他必須/不得不在七點(diǎn)鐘之前到那里。,他們將必須/不得不在六點(diǎn)鐘起床。,have to,5. must和have to,3)你一定不要去酒吧。 你沒(méi)有必要起那么早。 歸納:must的否定式must not /mustnt翻譯 成“ ”,表示“禁止
25、”做某事;dont have to譯成“ ”,表示“沒(méi)有必要做某事”。 4) 我今天必須得還書嗎? 是的,必須還。/不,不必。 歸納:回答must(表必須)提出的問(wèn)題,肯定回答用 ,否定回答用 。,You mustnt go to the bar.,You dont have to get up so early.,禁止、不許,不必,Must I return the book today?,Yes, you must. / No, you neednt (=dont have to).,must,neednt 或 dont have to,5. must和have to,5)那個(gè)人肯定有七十
26、多歲了。 他現(xiàn)在一定在睡覺(jué)。 街道是濕的,昨晚肯定下過(guò)雨。 歸納:在以上肯定句中,must一般翻譯成 ,表示一種推測(cè)、 判斷 : a. “must+動(dòng)詞原形”表示對(duì)現(xiàn)在情況的推測(cè)、判斷; b. “must be doing”表示對(duì) 的 動(dòng)作的推測(cè)、判斷; c. “must have done”表示對(duì) 動(dòng)作的推測(cè)、判斷。,That man must be over seventy years old.,He must be sleeping now.,The street is wet. It must have rained last night.,一定、肯定,正在進(jìn)行,過(guò)去,5.must和h
27、ave to,總結(jié): 1.must譯成“必須” ,用于表示說(shuō)話人的主觀看法,即:說(shuō)話人覺(jué)得自己“必須”或“ 應(yīng)當(dāng) ”做某事;have to譯成“不得不”,表示外界的客觀情況使說(shuō)話人 不得不 去做某事。 2. have to有時(shí)態(tài)和人稱的變化,而must沒(méi)有人稱的變化,只有現(xiàn)在式。 3.must的否定式must not /mustnt翻譯成“禁止、不許”,表示“禁止”做某事;dont have to譯成“不必”,表示“沒(méi)有必要做某事”。 4.回答must(表必須)提出的問(wèn)題,肯定回答用must,否定回答用 neednt 或 dont have to 。 5.在肯定句中,must一般翻譯成 一定、
28、肯定 ,表示一種推測(cè)、 判斷 : a. “must+動(dòng)詞原形”表示對(duì)現(xiàn)在情況的推測(cè)、判斷; b. “must be doing”表示對(duì) 正在進(jìn)行的 動(dòng)作的推測(cè)、判斷; c. “must have done”表示對(duì) 過(guò)去 動(dòng)作的推測(cè)、判斷。,Step 3,Step 3,Step 3,Step 3,2.情態(tài)動(dòng)詞其他用法要點(diǎn) 1) cannot but +do sth表示“不得不,只好”。 如:I cannot but choose to go . 2) may as well 結(jié)構(gòu) “may /might as well +動(dòng)詞原形”意為“最好,滿可以,倒不如”,相當(dāng)于had better 或to
29、 have no strong reason not to .如: 你最好馬上就做這件事。 We may as well stay where we are .,我只好去。,You may as well do it at once .,我們留在現(xiàn)在的地方倒也不錯(cuò)。,Step 3,3) can not (或never )等否定詞與enough 連用表示“再也不為過(guò)”。具體用法見(jiàn)形容詞、副詞專題。 4) Why/How +should 結(jié)構(gòu)表示說(shuō)話人對(duì)某事不能理解、感到意外、驚異等。意為“竟會(huì)”。如: Why should you be so late today ? How should I
30、know? 5)must 表示“偏要、硬要”做某事。如: How old are you ,madam ? (如果你硬要知道的話), Im twice my sons age .,你今天來(lái)得怎么這么晚?,我怎么會(huì)知道?(意為:我不知道),If you must know,Step 3,6) need 和dare的用法 need和dare 兩者既可用作 情態(tài)動(dòng)詞 也可用作 行為動(dòng)詞 。作行為動(dòng)詞時(shí),有 人稱 和 數(shù) 的變化,可用于 肯定句 、 否定句 或 疑問(wèn)句 中,構(gòu)成否定句或疑問(wèn)句時(shí)要用助動(dòng)詞do, does ,did ;作情態(tài)動(dòng)詞時(shí),沒(méi)有 人稱 和 數(shù) 的變化(dare 可以有過(guò)去式dar
31、ed)直接跟 動(dòng)詞原形 ,只用于 否定句 和 疑問(wèn)句 中,構(gòu)成否定句和疑問(wèn)句時(shí)不用助動(dòng)詞。 另外,dare作情態(tài)動(dòng)詞時(shí),還可用于條件句中,過(guò)去式為dared;作行為動(dòng)詞時(shí),dare用于疑問(wèn)句或否定句,后面的to也可省略;I dare say 是習(xí)慣說(shuō)法,意為,“我想,大概”。如: He neednt do that .(情態(tài)動(dòng)詞)他不必那么做。 He doesnt need to do it .(行為動(dòng)詞) 他不必做它。 I didnt know whether he dared say that to him .(情態(tài)動(dòng)詞,有時(shí)態(tài)變化) 我不知道他是否敢對(duì)他說(shuō)那個(gè)。 He didnt dar
32、e (to )do that .(行為動(dòng)詞) 他不敢那么做。 He dared not do it .(情態(tài)動(dòng)詞)他不敢做它。 注意:need 作行為動(dòng)詞時(shí),還可表示“需要”,后接動(dòng)名詞的主動(dòng)形式表示被動(dòng)含義(詳見(jiàn)“非謂語(yǔ)動(dòng)詞專題”)。如: The floor needs sweeping. 這地需要打掃了。,Step 4 高考連接,1.(10安徽32) Jack described his father, who _a brave boy many years ago, as a strongwilled man A. would be B. would have been C. must
33、be D. must have been 答案:D. 考點(diǎn):本題考查情態(tài)動(dòng)詞推測(cè)用法。 解析:句意為“杰克把他的父親描述為一個(gè)意志堅(jiān)強(qiáng)的人,他的父親多年前肯定很勇敢。” 用must have been表示對(duì)過(guò)去事情的肯定推測(cè)。,2.(10湖南23) You buy a gift, but you can if you want to. A. must B. mustnt C. have to D. dont have to 答案:D 考點(diǎn):情態(tài)動(dòng)詞 解析:dont have to 意為“沒(méi)有必要”,符合語(yǔ)境, 句意為:“你沒(méi)有必要買禮物,但如果你想買的話,你也可以買?!?3. (10江西23)
34、 I have told you the truth. _ I keep repeating it? A .Must B. Can C. May D. Will 答案:A 考點(diǎn):考察情態(tài)動(dòng)詞的用法。 解析: must 必須, 一定 can 可以, 能夠 may 也許 will 意愿, 傾向性動(dòng)作, 前半句說(shuō)我 告訴你事實(shí)了, 這里用的是現(xiàn)在完成時(shí), 表示過(guò)去的動(dòng)作對(duì)現(xiàn)在造成了影響, 既然我已經(jīng) 說(shuō)了, 我還必須重復(fù)一遍嗎?,4. (10山東25)I_ have watched that movie itll give me horrible dreams. A. shouldnt B. nee
35、dnt C. couldnt D. mustnt 答案:A 考點(diǎn):本題考查情態(tài)動(dòng)詞的用法。 解析:句意應(yīng)為“我本來(lái)不應(yīng)該看那部電影的-它會(huì)使我做噩夢(mèng)的?!北硎尽氨緛?lái)不應(yīng)該 做而做了某事”用shouldnt have done, 所以A項(xiàng)正確。,5. (10天津9) Mark have hurried. After driving at top speed, he arrived half an hour early. A. neednt B. wouldnt C. mustnt D. couldnt 答案:A. 考點(diǎn):考查情態(tài)動(dòng)詞。 句意:邁克本來(lái)不必要那么忙的。這么高速駕駛之后,他早半個(gè)小時(shí)
36、到達(dá)了。 解析:根據(jù)后面的語(yǔ)境,提前半個(gè)小時(shí)到達(dá),說(shuō)明Mark本來(lái)不必那么匆忙,所以用neednt have done 結(jié)構(gòu),表示“本來(lái)不必要做某事的而實(shí)際上做了”。,6. (10四川3) I take the book out? w_w w. k#s5_u.c o*m Im afraid not. A. Will B. May C. Must D. Need 答案:B 考點(diǎn):考查情態(tài)動(dòng)詞。 解析:表請(qǐng)求可用情態(tài)動(dòng)詞can, may, could, might ,表允許用can, may. 句意為:“我可以將這本書帶出去嗎?”“恐怕不行”。故應(yīng)選表情請(qǐng)求的情態(tài)動(dòng)詞may。正確答案為B。,7.
37、(10全國(guó)29) .Just be patient .You _ expect the world to change so soon . A. cant B. neednt C. may not D. whether 答案:A 句意:耐心一點(diǎn)兒,你不能期望世界變化如此快。 解答:通過(guò)選項(xiàng)此題考察情態(tài)動(dòng)詞,cant在否定句中可以表示推測(cè),譯為不可能,可以 表示能力,譯為不能夠,也可以表示命令,不允許,但是語(yǔ)氣比mustnt弱,具有勸慰的 意思,根據(jù)句意此題中選擇A,cant表示勸慰。,8. (10江蘇25) I havent got the reference book yet, but Il
38、l have a test on the subject next month. Dont worry. You_ have it by Friday. A. could B. shall C. must D. may w_ 答案:B, 解析:shall在第二人稱中表示允諾,還可以表示強(qiáng)制,命令,威脅,警告。還有在法律條 文中的要求或規(guī)定。,9. (10陜西 23) May I take this book out of the reading room? No, you . You read it in here. A. mightnt B. wont C. neednt D. mustnt
39、 答案:D 解析:考查情態(tài)動(dòng)詞。英語(yǔ)中用could,might表示詢問(wèn)或征求意見(jiàn)的問(wèn)句中,肯定性應(yīng)答 要用can或may來(lái)代替could或might,而may或might征求意見(jiàn)的問(wèn)句否定應(yīng)答時(shí)要用 mustnt,故本題選D。,10. (10全國(guó)17)Im afraid Mr. Harding _see you now. Hes busy. A. cant B. mustnt C. shouldnt D .neednt 答案:A 解析:情態(tài)動(dòng)詞考查。結(jié)合語(yǔ)境,根據(jù)情態(tài)動(dòng)詞用于疑問(wèn)或否定推測(cè)時(shí),要用cant。,11. (10湖北79) Its said that they have swum t
40、o the island from the continent, but they _(不可能做到) because the ocean in between is too wide. (do) 答案:cant/ couldnt have done it 考點(diǎn):情態(tài)動(dòng)詞 解析:當(dāng)要對(duì)過(guò)去進(jìn)行肯定的推測(cè)時(shí),要用 “cant/couldnt+have+done”的結(jié)構(gòu),12.(10遼寧26) .Doctors say that exercise is important for health, but it _ be regular exercise. Acan Bwill Cmust Dmay
41、答案:C 句意:醫(yī)生說(shuō)鍛煉對(duì)身體重要,但是必須是有規(guī)律的鍛煉。 解析:考查情態(tài)動(dòng)詞。Can一般表示“可能,或能力”;will表示“意志”;may表示“許可,可能”;must表示“必須”。,13. (10北京23) -Good morning. Ive got an appointment with Miss Smith in the Personnel Department. -Ah, good morning. You be Mrs. Peters. A. might B. must C. would D. can 答案:B 考點(diǎn):本題考查情態(tài)動(dòng)詞在語(yǔ)境中的運(yùn)用。 解析:第一個(gè)說(shuō)話人說(shuō)和史密
42、斯小姐有約,那下面的人就回應(yīng)說(shuō),那您一定就是Mrs. Peters了因此排除A,C.D,14. (10浙江17) “You _ have a wrong number,” she said. “Theres no one of that name here.” A. need B. can C. must D. would 答案:C 考點(diǎn):情態(tài)動(dòng)詞,15. (10上海29) -Sorry, Professor Smith. I didnt finish the assignment yesterday. -Oh, you have done it as yesterday was the deadline. A. must B. mustnt C. should D. shouldnt 答案:C 考點(diǎn):本題考查的是虛擬語(yǔ)氣 解析:此處表示和過(guò)去事實(shí)相反的情況,應(yīng)該用should + have + 過(guò)去分詞。本來(lái)應(yīng)該做,而未做。,Thanks for listening,
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