情态动词练习题及答案

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(完整版)情态动词专项练习及答案

(完整版)情态动词专项练习及答案

情态动词专项练习1。

Jean have kept his promise. I wonder why he changed his idea.A. mustB. should C。

need D. would解析:选B。

“should have +过去分词” 表示“过去本来应该(但没能)做某事”;keep one’s promise 意为“信守诺言”。

2。

Jane have come to the party, but she not find the exact time。

A. could; couldB. might; couldC. should; could D。

should; would解析:选A。

“ could have+过去分词表示过去本来应该(但没能)做某事”.3. So many mistakes in your homework! You more careful.A。

may be B. had to C. would be D. should have been解析:选D。

“You should have been more careful”。

意为:你本来应该更细心的。

4.Her brother be at home now, because he was seen playing basketball in the stadium just now.A。

mustn’t B. needn’t C。

can’t D. shouldn't解析:选C。

can’t be at home 意为:不可能在家.5.-——I can’t understand why ou r boss is late.———He the early bus.A。

could miss B。

may have missedC. can have missed D。

might miss解析:选B. “may have+过去分词"表示对过去动作的判断,意为:可能做了某事。

有关情态动词的专项练习题及答案

有关情态动词的专项练习题及答案

情态动词的专项练习题及答案有关情态动词的专项练习题及答案情态动词,本身有一定的.词义,表示语气的单词。

但是情态动词不能独立作谓语,只能和动词原形一起构成谓语。

接下来由小编给您带来情态动词的专项练习题及答案,希望对您有所帮助!情态动词的专项练习题及答案篇11.( )you tell me what’s happening over there ?A. Could B. May C. Might D. Shall2.( ) I have a word with the manager ,sir ?A. Will B. Would C. May D. Can3.— Something flying far away must be a hawk .— No, it( ) be a hawk .A.mustn’t B.mightn’t C.can’t D. might4. Man ( )reach the moon or any other star in the universe now, but we get there years ago .A. can ;couldn’t B. are able to ;weren’t able toC. must ;needn’t D. can ; had to5. Grandfather ,( ) my sister come ?A. Will B. shall C. would D. could6.“ What I do for you ? ” means “( ) I help you ? ”A. can , May B. shall ; Need C. can ; Can D. will ;Shall7.—Could I borrow your dictionary?—Yes, of course you ( ).A. Might B. will C. can D. should8.The fire spread through the hotel very quickly but everyone ( )get out.A. had to B. would C. could D. was able to9. The monitor must be in the reading-room, ( )?A.mustn’t B.doesn’t C.needn’t D.isn’t10.He hardly ( )say anything more,since you know all about it.A.don’t B.needn’t C. needs D. need11.You ( )to the meeting this afternoon if you have something important to do.A.needn’t to come B.don’t need comeC.don’t need coming D.needn’t come12.—May I pick a flower in the garden ? — ( ).A. No,you needn’t B. Not, pleaseC. No,you mustn’t D. No,you won’t13.—Helen, will you be at the party tonight ?—Yes, but I have so much homework to do that I really ( ).A.won’t B.can’t C.mustn’t D.shouldn’t14. If you listen to me, you ( ) have some candies,Deary .A. shall B. May C. will D. must15. Peter ____ come with us tonight,but he isn’t very sure yet.A. May B. Can C. will D. must16.—Dare you go home at night ?—_________.A. Yes, I do B. No,I daren’tC. No,I don’t D. Yes, I dare so.17. When you go abroad, do you _____ take your passport ?A. have to B. ought to C. be able to D. need18.—You must phone us every week.—Yes, I _____.A. must B. have to C. will D. should19.—Your language teacher looks a rather kind woman.—But in fact she is cold and hard on us. You _____ believeA. should B.wouldn’t C.mustn’t D. might not.20. A wise man __ sometimes make a mistake.A. can B. may C. might D. must21.—Shall I tell John about it ?—No, you ( ).I’ve told him already.A.needn’t B.wouldn’t C.mustn’t D.shouldn’t22. Tom ought not to ( )me your secret,but he meant no harm.A. have told B. tell C. be telling D. having told23.—When can I come for the photos ? I need them tomorrow afternoon.—They ( )be ready by 12:00.A. Can B. should C. Might D. need24.Sorry I’m late. I ( )have turned off the alarm clock and gone back to sleep again.A. Might B. should C. Can D. will25.—Are you coming to Jeff’s party ?—I’m not sure. I ( )go to the concert instead.A. must B. should C. Would D. might参考答案:ACCAB CBCCD DDDCB AABAC AAAAB情态动词的专项练习题及答案篇21. Peter ________come with us tonight, but he isn’t very sure yet.A. mustB. canC. mayD. will2. — Could you borrow your dictionary?— Yes, of course you ________.A. mightB. willC. canD. should3. A computer ________think for itself, it must be told what toA. can’tB. couldn’tC. may notD. might not4. I didn’t hear the phone, I ________asleep.A. must beB. must have beenC. should beD. should have been5. There was plenty of time, she ________.A. mustn’t have hurriedB. couldn’t have hurriedC. must not hurryD. needn’t have hurried6. The plant is dead. I ________it more water.A. will giveB. would have givenC. must giveD. should have given7. Very loud noises ________make people ill, hurt their ears, or even drive them mad.A. mustB. needC. canD. should8. He asked me for the dictionary many times; please tell him that he ________have it tomorrow.A. mustB. needC. mayD. dare9. — Why is she still standing there?— She ________be waiting for her boyfriend.A. canB. mustC. dareD. need10. Two eyes________ see more than one.A. canB. mustC. mightD. shall11. What ________he mean? ________you tell me?A. can; MayB. can; CanC. may; MayD. must; Should12. How ________he say that his teacher was unfair?A. mustB. mightC. couldD. need13. It ________be very cold in this part.A. canB. oughtC. shallD. dare14. I’d like to ask a question if I ________.A. mustB. willC. mayD. might15. Even in summer the temperature ________suddenly drop below freezing.A. mightB. oughtC. mustD. need16. He decided to join the army so that he ________defend the country.A. may helpB. might helpC. helpsD. helped17. You ________always be talking like that.A. mightn’tB. mayn’tC. can’tD. mustn’t18. The car ________have broke doown just when we were about to start off.A. mustB. couldC. mightD. should19. You ________see him while he is in hospital.A. have betterB. had betterC. would ratherD. had to20. There is a fine sunset; it ________to be a fine day tomorrow.A. oughtB. shouldC. has toD. has better21. You are his father, you ________take care of him.A. mightB. oughtC. ought toD. are able to22. That’s all. It ________be talked about any more.A. needn’tB. mightn’tC. darn’t toD. needn’t to23. The question ________discussing.A. needsB. needC. can beD. must be24. He ________even look out of the window.A. daren’tB. daresn’tC. dared not toD. dares not25. I’m so hungry that I ________find something to eat.A. have toB. wouldC. mayD. can26. All the students ________do their best for the modernization of our country.A. canB. shouldC. mayD. might27. You ________be careful with your homework.A. mustB. have toC. mayD. are used to28. It is getting darker. You ________not go home.A. had betterB. have betterC. would ratherD. would like29. I ________what happened to our school.A. would like knowB. would like to knowC. would like knowingD. would like that I know30. — Would you mind my changing the plan?— ________.A. Oh, no, pleaseB. Yes, I mind notC. No, I wouldD. Yes, I will31. — It ________ be Jack who is in the library.—I’m sure it ________be him, I saw him off at the railway station just two days ago.A. can’t; can’t eB. must; mustn’tC. must; can’tD. can’t; mustn’t32. I ________tell her the truth about his marriage.A. can’t helpB. can’t butC. may not helpD. mustn’t but33. Since she is angry, we ________.A. had better to leave her alongB. should leave her aloneC. would rather to leave her aloneD. must leave her alone34. Look! What you’ve done to me. You ________more careful.A. maybeB. had toC. should have beenD. would be35. ________read the letter for you?A. Would you like meB. Do you want meC. Will you mind meD. Shall I36. He promised he ________not make such silly mistakes.A. wouldB. shouldC. mightD. could37. ________it be true that his father will go abroad?A. CanB. MayC. NeedD. Should38. Those streams are so small that they ________be shown in the maps.A. mustn’tB. may notC. can’tD. may39. — May I use your bike?— ________.A. No, you may notB. No, you mustn’tC. No, you won’tD. Sorry, I’m afraid not40. — Must I write to her?— No, you ________.A. mustn’tB. shouldn’tC. can’tD. don’t have to41. — Need I start tonight?— Yes, you ________.A. doB. needC. mustD. may42. The old man ________sit for hours watching the ships.A. wouldB. shouldC. was used toD. would rather to43. If the telephone ________ring, please wake me up.A. wouldB. shouldC. willD. might44. I wish they ________stop making remarks about me.A. wouldB. willC. shouldD. shall45. You’re thirsty, aren’t you? ________he get some coffee?A. DoesB. ShallC. WouldD. Let46. Which of the following is wrong?A. That may be true.B. That might be true.C. That can be true.D. That could be true.47. — Would you lend me some money?— Yes, I ________.A. wouldB. willC. canD. may48. He ________ swimming when he was young.A. was used to goB. got used to goC. used to goingD. used to go49. You say you ________ not do it, but I say you ________do it.A. will; shallB. shall; shallC. shall; willD. will; will50. You ________out yesterday without a coat. No wonder youcaught cold.A. should have goneB. shouldn’t have goneC. could not have goneD. might have gone51. He ________the 8:30 train because he didn’t leave home until 9:00.A. can’t catchB. couldn’t catchC. may notD. can’t have caught52. You ________us this because we had more than enough.A. needn’t bringB. needn’t have broughtC. mustn’t bringD. co uldn’t have brought53. — He learnt the language in three months.— He ________very hard.A. must workB. might have workedC. must have workedD. might work54. — Who told you my telephone number?—I don’t remember. It ________Mary.—It can’t be Mary, she doesn’t know it.A. may have beenB. can have beenC. must beD. can be55. You ________him, why didn’t you?A. ought to thankB. ought have thankedC. ought to have thankedD. ought thank56. I ________have arrived a little earlier, but my car broke down.A. shouldB. couldC. canD. can’t57. — ________we go out for a walk?—Great. Let’s goA. ShallB. WillC. MayD. Should58. Though she was seriously ill, she ________ complete the work in time.A. wouldB. was able toC. was possible toD. might59. — Would you like to play chess with me?— Yes, ________.A. I’dB. I wouldC. I’d likeD. I’d like to60. Tom is late. He ________the wrong bus.A. must takeB. must have takenC. might takeD. could take1—10. CCABD DCCBA 11—20. BCACA BDDBA 21—30. CAAAA BAABA 31—40. CBBCD AACDD 41—50. CABAB CBDAB 51—60. DBCAC BABDB。

初中英语情态动词专项练习(附答案解析)

初中英语情态动词专项练习(附答案解析)

初中英语情态动词专项练习(附答案解析)一、单选题1.—Must I hand in the homework right now?—That's the rule.A.Yes, you can.B.No, you can't.C.Yes, you must.D.No, you mustn't.1.答案C解析句意:—我必须现在交作业吗?—这是规则。

是的,,你必须。

A. Yes,you can.“是的,你能”;B. No,you can't.“不,你不能”;C. Yes,you must.“是的,你必须”;D. No,you mustn't.“不,你禁止”。

回答must引导的一般疑问句,肯定用must,表示"必须"。

故选C。

点评考查情态动词引导的一般疑问句的回答,掌握情态动词must的用法。

2.You don't look well, you __________ see the doctor.A.ought to B.may C.can D.Might 2.答案A解析句意:你看起来不好,你应该去看看医生。

根据“看起来不好”可以得知是应该去。

A. ought to “应该”;B. may “可能”;C. can“ 会”;D. might“可能”。

故选A。

点评考查情态动词,区分ought to;may ;can和might的含义和应用。

3.What a beautiful day! You ______ take your umbrella at all.A.needn't B.mustn't C.can't D.may not 3.答案A解析句意:多好的天气啊!你根本不需要带伞。

A. needn't “不必”;B. mustn't“禁止”;C. can't“不可能”;D. may not“或许不会”。

英语情态动词题20套(带答案)含解析

英语情态动词题20套(带答案)含解析
【答案】D
【解析】
【详解】
考查must have done结构。句意:——吉姆一定觉得我说的话很让人烦,尽管他什么也没说。——所以你是说你得向他道歉?根据“though he didn’t say anything.”可知此处表示对过去事情的肯定推测,用must have done表示“过去一定做了……”,故D项正确。
2、should作为情态动词,可以用在条件状语从句中,表示语气较强的假设,译作“万一”、“竟然”,这时也可将should置于从句之首,即将should放在主语前面,而省略从属连词if。例如:If you should fail to come, ask Mrs Chen to work in your place.(= Should you fail to come, ask Mrs Chen to work in your place.)
A.mayB.canC.mustD.ould
【答案】C
【解析】
【详解】
考查情态动词表猜测的用法。句意:一定是汤姆把车停在这儿的,因为他是唯一有车的人。A. may可能;B. can可能;C. must一定;D. should应该。由as he is the only one with a car.可知一定是他把车停在这里的,非常有把握的肯定推测,故选C。
2.One of our rules is that every student _______ wear school uniform while at school.
A.mightB.could
C.shallD.will
【答案】C
【解析】
【详解】
考查情态动词辨析。句意:我们其中一条规则要求每个学生在校期间都要穿校服。shall可以表示“命令,警告,强制要求;允诺;法律,规定要做……”,结合句意可知C正确。

情态动词的用法及练习(附答案)

情态动词的用法及练习(附答案)

情态动词的用法及专项练习第1 & 2类:词形词的含义例句can ①“能力”②“允许”③“可能性”(0%)④“请求”I can speak English.Can I go to the toilet.It can’t be Susan. She is in Paris. Can you help me?could ①“过去的能力”②“过去的允许”③“可能性”(30%)④“请求”, 比can更客气⑤“建议”⑥“将来的一种可能性”She could speak English When she was 5 years old. Could I borrow your dictionary?It could get much colder in January.Could you please say that again more slowly.We could try to fix it ourselves.I think we could go to war again.be able to “能力”= can, 但比can的时态更具多样性。

can无法表达的时态,用be able to表达。

She will be able to teach English. (一般将来时)She was able to talk when she was 2 years old. (一般过去时)I would love to be able to play the piano. (动词不定式)may ①“请求、允许”(比较礼貌)②“将来的可能性”(50%)③may 在更多的时态中经常May I come in?It may rain tomorrow.第1类:十大情态动词can / could / may / might / must / ought to / shall / should / will / would 第2类:半情态词及充当情态动词的词had better / be able to / have to / used to / need / dare用be allowed to来代替might “较小的可能性”(≤30%)I might move to Canada some day.must ①“必须”(责任、义务)②“可能性”(推测) (100%)③“禁止”(否定式) Everyone must pay taxes.She didn’t arrive. She must be sick.You mustn’t p l ay with fire. It’s dangerous.have to ①“必须、不得不”(客观上不得不做)②多种时态里面代替“must”,因must只有一般现在,但have to 可以有多种时态。

高中英语情态动词形式练习题40题含答案解析

高中英语情态动词形式练习题40题含答案解析

高中英语情态动词形式练习题40题含答案解析1.She is very quiet. She ____ be shy.A.mustB.canC.mightD.should答案解析:C。

must 表示肯定的推测,语气非常强;can 表示可能性,但在这个语境中不太符合;might 表示可能性较小,符合“她很安静”这个描述推测她可能害羞;should 表示应该,不符合推测的意思。

2.The book is missing. Someone ____ have taken it.A.mustB.canC.mightD.should答案解析:A。

书不见了,一定是有人拿走了,must 表示肯定的推测,语气很强。

can 和might 语气较弱;should 表示应该,不符合语境。

3.He is always late. He ____ be very disorganized.A.mustB.canC.might答案解析:A。

他总是迟到,肯定是非常没有条理,must 表示肯定的推测,语气强。

can 和might 可能性较小;should 表示应该,不合适。

4.The lights are on. Someone ____ be at home.A.mustB.canC.mightD.should答案解析:A。

灯亮着,肯定有人在家,must 表示肯定的推测,语气强。

can 和might 可能性较小;should 表示应该,不符合语境。

5.The test was very difficult. She ____ have passed it.A.mustB.canC.mightD.should答案解析:C。

考试很难,她可能通过了,might 表示可能性较小。

must 语气太强;can 表示可能性,但不太符合这个语境;should 表示应该,不符合推测的意思。

6.He looks very tired. He ____ have worked hard.A.mustB.canD.should答案解析:A。

情态动词测试题及答案

情态动词测试题及答案

情态动词测试题及答案一、选择题1. You _______ be careful when you cross the street.A. canB. mustC. shouldD. may答案:B2. She _______ be at home now because she called me a moment ago.A. canB. mustC. mightD. could答案:B3. I _______ finish my homework before I go out to play.A. canB. mustC. wouldD. should答案:B4. You _______ wait for me at the bus stop; I'll be there infive minutes.A. needB. mustC. canD. may答案:C5. They _______ have finished their work by now.A. canB. mustC. shouldD. might答案:C二、填空题6. It’s cold outside. You _______ wear a coat.答案:should7. The doorbell rang, _______ it be the postman?答案:could8. _______ you tell me the way to the library?答案:Could9. I _______ go to the party, but I have to finish my report first.A. canB. mustC. wouldD. should答案:C10. _______ I borrow your pen for a moment?答案:May三、改错题11. He can go to the concert, but he must to stay at home.错误:to stay正确:must stay12. She might have finished her work, but I think she should be working now.错误:might have finished正确:may have finished13. You should to call your parents before you leave.错误:to call正确:should call14. I would like to go to the beach, but I can’t afford it.错误:would like正确:could15. They must have been at the meeting, but they were actually at the cinema.错误:must have been正确:could have been四、翻译题16. 他可能已经完成了他的作业。

情态动词练习题带答案

情态动词练习题带答案

情态动词练习题带答案一、单项选择情态动词1.—CanIpaythebillbycheck—Sorry,ir.Butitithemanagementruleofourhotelthatpayment_____bemadeincah.A.hallB.needC.willD.can【答案】A【解析】【详解】考察情态动词用法。

句意:——我能用支票付账吗——对不起,先生。

但这是我们酒店的管理规定,支付要用现金。

hall可以表示命令,警告,强制,或者指规则和法律要求做的事情。

本题正是考察了hall表示按照规则和法律要求做的事情。

故A正确。

2.Mr.Baker,ometudentwanttoeeyou.______theywaithereoroutideA.MayB.ShouldC.ShallD.Will【答案】C【解析】【详解】考查Shall的用法。

句意:贝克先生,有些学生想见你。

他们是在这里等还是在外面等Shall用于第一、第三人称疑问句中,表示说话人征求对方的意见或向对方请示。

故选C。

【点睛】Shall的用法Shall作为助动词,一般用于第一人称Ⅰ和We,表示一个将来的动作,构成将来时态。

Shall后面接动词原形。

例如:(1)IhallthinkitoverandLetyouknowmyidea.我将考虑一下此事,然后告诉你我的想法。

1.Shall用于第一人称,表示征求对方的意愿。

如:Whathallwedothievening2.Shall用于第一、第三人称疑问句中,表示说话人征求对方的意见或向对方请示。

如:ShallwebeginourleonWhenhallhebeabletoleavethehopital3.Shall用于第二、第三人称,表示说话人给对方命令、警告、允诺或威胁。

如:Youhallfailifyoudon'tworkharder.(警告)HehallhavethebookwhenIfinihreading.(允诺)Hehallbepunihed.(威胁)3.---Hi,Johnon,anyideawhereSuaniA.canbeB.muthavebeenC.mighthavebeenD.houldbe【答案】D【解析】考查情态动词的用法。

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情态动词练习题及答案have kept his promise. I wonder why he changed his idea.A. mustB. shouldC. needD. would解析:选B. “should have +过去分词” 表示“过去本来应该做某事”;keep one’s promise 意为“信守诺言”。

not find the exact time.A. could; couldB. might; couldC. should; couldD. should; would解析:选A.“ could have+过去分词表示过去本来应该做某事”。

more careful.A. may beB. had toC. would beD. should have been解析:选D. “You should have been more careful”. 意为:你本来应该更细心的。

4.be at home now, because he was seen playing basketball in the stadium just now.A. mustn’tB. needn’tC. can’tD. shouldn’t解析:选C. can’t be at home 意为:不可能在家。

5.---I can’t understand why our boss is late.the early bus.A. could missB. may have missedC. can have missedD. might miss解析:选B. “may have+过去分词”表示对过去动作的判断,意为:可能做了某事。

注意:can表示可能时,只能用于疑问句和反问句。

6. She didn’t answer the phone, she ______ asleep.A. may beB. must beC. should have beenD. must have been解析:选D. 表示:对过去发生的事情的肯定推测。

7.The little girl’s eyes were red. She ______.A. may cryB. must cryC. must be criedD. must have been crying解析:选D. 意为:她刚才肯定一直在哭。

对过去某事正发生的推测。

8.He______ his supper now, for the dining hall is still closed.A. can’t be havingB. needn’t be havingC. mustn’t be havingD. shouldn’t be having解析:选A. 对现在正在发生的事情的否定推测。

9.I parked my bike behind the building, but nowit is gone. It ________ .A. may be stolenB. must be stolenC. must have been stolenD. must have stolen解析:选C. 对过去发生的事情的肯定推测的被动式。

10. ______ Mr. Black_______go to work by ferry before the bridge was built?A. Did; used toB. Use; toC. Did; use toD. Does; use to解析:选C. used to do的疑问式,可以是Used+主语+to do ?或Did +主语+use to do?11. The hotel is only a stone’s throw away, you ______ take a bus.A. need not toB. not need toC. don’t needD. need not解析:选D. 说话人认为不必要乘车, need 为情态动词。

12. I am busy now, _______ my brother do it for you ?A. WillB. ShallC. MustD. May解析:选B. 在疑问句中shall 用于第三人称,也表示征求意见。

13. ---You needn’t do it right now, need you?---Yes I am afraid I ______ .A. needB. needn’tC. mustD. mustn’t解析:选C. Yes的意思是:不。

意为:恐怕我必须现在就做。

14.My English-Chinese dictionary has disappeared . Who _____ have taken it?A. shouldB. mustC. couldD. would解析:选C. could/can have done 用于否定推测和疑问推测。

15. ---The room is so dirty._______ we clean it? ----Of course.A. WillB. ShallC. Would D. Do解析:选B. shall 用在疑问句中,常用于第一,三人称,表示征求意见或请求指示。

16. If you have something important to do, you ______ waste any time.A. needn’tB. mustn’tC. may notD. won’t解析:选B. 根据句意用mustn’t17. If you want to borrow a football after school, your student card______ here.A. has to leaveB. must leaveC. has to be leftD. must be left解析:选C. have to 表示客观需要,must表示主观需要。

学生证必须放在此是客观需要。

18. “ Did you scold him for his carelessness?”“Yes, but _____ it”A. I’d rather not doB. I’d rather not have doneC. I shouldn’t doD. I’d better not do解析:选B. would rather 加完成时表示对完成了的或过去了的事情的态度。

意为:当时是不情愿做的。

19. “ Don’t get near to it . It is too dangerous!”“_______” .A. Yes, I won’tB. No, I don’tC. No, I can’tD. No, I won’t解析:选D. A为错误的表达方式;B和C没有直接回答对方的问候。

20. He must be in the classroom, _______ he?A. mustn’tB. can’tC. isn’tD.can解析:选C. 对表否定的must进行反意疑问时,要用句子的实义动词21. He________ be in the garden. He must be in the room.A. can’tB. mustn’tC. will notD. may not解析:选A. 否定推测用can’t不用mustn’t22. “Do you have to leave now?”“I am very sorry, but I really______.”A. can’tB. haveC. shouldD. must解析:选D. 回答have to 的疑问句用must作肯定回答。

23. “Let’s go to the library, shall we?”“_________?”A. No, I can’tB. Yes, I willC. Yes , thank youD. No, we’d better not解析:选D. A,B,C都不能回答shall we, 此处D的语气比较婉转客气。

24. “Can I take it away?”“ You ______ better not.”A. shouldB. couldC. wouldD. had解析:选D. had better 与不带to 的不定式构成谓语,可以变成疑问句:Hadn’t you better----25. You _______ have brought your camera. They all had theirs with them.A. couldn’tB. needn’tC. wouldn’tD. mustn’t解析:选B. 本来不必要做某事.26. See who is there!______it be May?A. MayB. MustC. CanD. Will解析:选C. 表推测时A,B都用作疑问句。

27. John______ be a basketball player. He is much too short.A. mayB. mustn’tC. can’tD. should解析:选C. 断然的不定推测用can’t28. The Chinese teacher looks so pale. She ______ be ill.A. mustB. mustn’tC. canD. need解析:选A. 表示有把握的肯定推测用must29. Something______to save our earth. Do you think so?A. can doB. must doC. has to doD. must be done解析:选D. “something must be done” 意为:必须采取措施。

30. Look at what you have done! You ______ be more careful.A. oughtB. canC. wouldD. should解析:选D. ought 后应用to31. — Has Li Lin started? He said he would join in the party.— He ______. He is a man of keeping his word.A. could have leftB. must have leftC. can’t comeD. won’t be coming解析:B。

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