1.(2006上海)Black holes __________ not be seen directly, so determining the number of them is a tough task.?
A. can B. should C. must D. need

答案:A
解析:本題考查情態(tài)動詞。句意“黑洞不可能直接看見,所以測定它們的數(shù)量是一項(xiàng)棘手的任務(wù)”,情態(tài)動詞can在此表示可能性,故選A。

2.(2007上海)— Guess what! I have got A for my term paper.?
— Great! You __________ read widely and put a lot of work into it.?
A. must B. should C. must have D. should have

答案:C
解析:本題考查情態(tài)動詞。對話的上句是“我的學(xué)期考試得了A”,下句意為“太好了!你肯定讀了很多書,下了很大功夫”,情態(tài)動詞在此表示對過去的推測,故選C。

3.(2008上海) According to the air traffic rules, you __________ switch off your mobile phone before boarding.?
A. may ? ? B. can ? ? C. would ? ? D. should

答案:D
解析:本題考查情態(tài)動詞。句意“根據(jù)空中交通規(guī)則,登機(jī)前應(yīng)該關(guān)閉手機(jī)”,情態(tài)動詞should在此表示告訴某人應(yīng)該做什么,故選D。

4.(2009上海)It __________ have been Tom that parked the car here, as he is the only one with a car.
A. may B. can C. must ? D. should

答案:C
解析:本題考查情態(tài)動詞。句意“準(zhǔn)時(shí)Tom把車停在了這兒,因?yàn)?我們這兒)只有他有車”,must have been通常表示對過去的猜測,語氣比較肯定,故選C。

5.(2010上海)— Sorry, Professor Smith. I didn’t finish the assignment yesterday.
— Oh, you __________ have done it as yesterday was the deadline.?
A. must B. mustn’t C. should D. shouldn’t

答案:C
解析:本題考查情態(tài)動詞。句意“對不起,Smith教授,我昨天沒有完成作業(yè)”,“哦,你不應(yīng)該這樣,因?yàn)樽蛱煲咽?完成)作業(yè)的截止期限”,“情態(tài)動詞should + have done”表示應(yīng)該做而沒有做的事,故選C。

6.(2010課標(biāo)全國_全國I) Just be patient. You _______ expect the world to change so soon.
A. can’t B. needn’t C. may not D. will not

答案:A
解析:本題考查情態(tài)動詞的用法。句意“耐心點(diǎn),你不能指望這個(gè)世界變得如此之快”。這里用can’t表示“不能,不可以,不可能”。needn’t沒有必要;may not可能不;will not將不,都不符合題意。

7.(2010遼寧) Doctors say that exercise is important for health, but it _______ be regular exercise.
A. can B. will C. must D. may

答案:C
解析:本題考查情態(tài)動詞的用法。句意“醫(yī)生說鍛煉對健康很有用,但那必須是經(jīng)常性的鍛煉”。can可能;will將會;must必須;may可能。

8.(2010陜西) -- May I take this book out of the reading room?
-- No, you _______. You read it in here.
A. mightn’t B. won’t C. needn’t D. mustn’t

答案:D
解析:本題考查情態(tài)動詞的用法。句意“我可以把這本書帶出閱覽室嗎?”“不行,絕對不可以。你(只能)在這里閱讀?!眒ightn’t可能不;will表意愿或決心;needn’t不必;mustn’t用于說話者要某人不做某事,絕對不可以。例如:You mustn’t leave the gate open.你不要敞著大門。

9.(2010江西) I have told you the truth. _______ I keep repeating it?
A. Must B. Can C. May D. Will

答案:A
解析:本題考查情態(tài)動詞的用法。句意“我已經(jīng)告訴你實(shí)情了。非要我一遍遍重復(fù)嗎?”must表示對方的行為使說話人不滿或懊悔,意為“偏要”。can, may用在句首表請求或疑問。

10.(2010山東) I _______ have watched that movie — it’ll give me horrible dreams.
A. shouldn’t B. needn’t C. couldn’t D. mustn’t

答案:A
解析:本題考查情態(tài)動詞的用法。句意“我本不應(yīng)該去看那部電影——它會使我做惡夢的?!眘houldn’t have done本不該做,但是做了;needn’t have done本沒必要做,但是做了;couldn’t have done表示過去不可能做了某事。無mustn’t have done結(jié)構(gòu)。根據(jù)題干所提供信息,應(yīng)該選shouldn’t。