21. Sally looks very happy. She ________ have got the first place in the 200­metre race.

　　A. should B. could

　　C. must D. might

　　[解析]本題考查“情態(tài)動詞+have done”。句意：Sally 看上去很高興。她200米賽跑肯定得第一名了。should have done，“本應(yīng)該干而事實上沒干”;could have done 有兩層含義：一表示過去可能干過;二表示過去本能夠干某事(而事實上沒干);must have done“過去肯定干過”;might have done 亦有兩層含義：一表示過去或許干過;二表示過去本可以干某事(而事實上沒干);由語境可知C項正確。

　　[答案]C

　　22.—Show me your permit, please.

　　—Oh, it's not in my pocket. It ________.

　　A. might fall out B. could fall out

　　C. should have fallen out D. must have fallen out

　　[解析]句意：—請出示許可證�！�噢，不在我口袋里。肯定是掉出來了。由語境可知，fall out 動作應(yīng)發(fā)生在過去，因為現(xiàn)在許可證不在口袋里，故應(yīng)用“情態(tài)動詞+have done”，排除A、B兩項;should have done“本應(yīng)該干某事(而事實上沒干)”，不符合句意;故正確答案為D項，指“過去肯定干過”。

　　[答案]D

　　23.—Tom hasn't turned up yet. He might have got lost.

　　—No, he ________. His car has got a GPS.

　　A. must not have got lost B. wouldn't have got lost

　　C. can't have got lost D. shouldn't have got lost

　　[解析]本題考查 “情態(tài)動詞+have done”。句意：—湯姆還沒到這。他可能迷路了�！�不，他不可能迷路。因為他的車上裝有GPS定位系統(tǒng)。must 表推測時只用于肯定的陳述句，故A項予以排除;wouldn't have done“不會……”，只用于虛擬語氣;can't have done“過去不可能干過”;shouldn't have done“本不應(yīng)該干某事而事實上已經(jīng)干了”;由句意可知C項正確。

　　[答案]C

　　24.—Where is Bob? I cannot find him anywhere.

　　—He ________ have been off long. I heard him make a call just now.

　　A. shouldn't B. can't

　　C. mustn't D. needn't

　　[解析]本題考查“情態(tài)動詞+have done”。句意：—鮑勃哪里去了?我到處找不到他�！�他不可能離開久了。我剛才還聽見他打電話了。shouldn't have done“本不應(yīng)該干某事(而事實上已干了)”;can't have done“不可能干過”;must 表推測不能用于否定句，故C項錯誤;needn't have done“本沒有必要干某事(而事實上已干了)”;由語境可知B項正確。

　　[答案]B

　　25.He ________ a big fortune, but he was too lazy to seize the opportunity.

　　A. can have made B. could have made

　　C. must have made D. ought have made

　　[解析]本題考查“情態(tài)動詞+have done”。can have done“過去可能干過”，一般不用于肯定的陳述句。could have done 意義有二：一表示“過去可能干過”;二表示“過去本能夠干某事而事實上沒干”;must have done“過去肯定干過”;D項表述錯誤，應(yīng)為 ought to have done表示“本應(yīng)該干某事而事實上沒干”;由句意“他本來能夠掙大錢，但他太懶沒抓住機會”可知B項正確。

　　[答案]B

　　26.—Do you still remember the day when we went to the Great Wall?

　　—I can't remember it well, but ________ it have been sometime last year?

　　A. would B. must

　　C. could D. should

　　[解析]本題考查“情態(tài)動詞+have done”。句意：—你還記得我們?nèi)ラL城的那一天嗎?—我記不太清了，是不是去年的某個時候?由語境可知，這是對過去某個時間的推測，并且用于疑問句，故只能選 could。

　　[答案]C

　　27.What a pity! Considering his intelligence and diligence, he ________ a higher grade.

　　A. can have achieved B. must have achieved

　　C. need have achieved D. might have achieved

　　[解析]本題考查“情態(tài)動詞+have done”。can have done“過去可能干過”，一般不用于肯定的陳述句;must have done，“過去肯定干過”;might have done 意義有兩層：一表示“過去可能干過某事”;二表示“過去本可能干某事而事實上沒干”;由句意“真遺憾!鑒于他的智力和努力，他本來能夠獲得一個更高一點的分?jǐn)?shù)”可知D項正確。

　　[答案]D

　　28.—Where is my dictionary? I remember I put it here yesterday.

　　—Perhaps, you ________ it in the wrong place.

　　A. must have put B. should have put

　　C. can have put D. might have put

　　[解析]本題考查情態(tài)動詞。must have done 表示對過去行為的推測，具有較大的可能性，意為“一定……;想必……”;should have done 表示應(yīng)該做的事情沒有做;can have done 表示過去可能做過。might have done 常用于推測過去的行為，表示“可能已經(jīng)”;還可以表示過去應(yīng)該做而沒有做的事。由句意：“—我的詞典呢?我記得我昨天放這兒了�！�或許你放錯了地方”可知D項正確。

　　[答案]D

　　29.—Sorry, the tickets have already been sold out.

　　—Really? Maybe I ________ a little earlier.

　　A. should come B. should have come

　　C. could have come D. must have come

　　[解析]本題考查“情態(tài)動詞+have done”。句意：—抱歉，票早已賣完。—真的嗎?或許我該早一點來。由語境可知，come 動作發(fā)生在過去，應(yīng)用“情態(tài)動詞+have done”，排除A項;should have done“本應(yīng)該干某事而事實上沒干”，符合語境;could have done“本能夠干而實際上沒干”;must have done“過去肯定干過”，均不合語境。

　　[答案]B

　　30.—No wonder you caught a cold. You ________ out last night without a coat.

　　—I know how silly I was.

　　A. shouldn't have gone B. mustn't have gone

　　C. couldn't have gone D. mightn't have gone

　　[解析]本題考查“情態(tài)動詞+have done”。A項意為“本不應(yīng)該干某事而事實上已干了”;B項表述錯誤，must 表推測時只用于肯定的陳述句;C項意為“過去不可能干過”;D項意為“過去或許沒干”;句意：—難怪你感冒了。你昨天晚上不應(yīng)該沒穿外套就出去�！�我知道我有多愚蠢。故可知A項正確。

　　[答案]A

　　31.You ________ not get my support if you do such a thing.

　　A.must B.may

　　C.shall D.need

　　[解析]shall 與第二人稱連用，表示警告，允許等語氣。

　　[答案]C

　　32.—I just want to know. Please tell me, how much do you make an hour?

　　—If you ________ know, I make $20 an hour.

　　A.will B.shall

　　C.must D.need

　　[解析]must 表示“偏要，一定要”。

　　[答案]C

　　33.—What do you think of the American singer Lady Gaga's performance?

　　—Too crazy, but if she ________ come to China to hold concerts, I would buy tickets for her live show.

　　A. would B. could

　　C. should D. might

　　[解析]本題考查虛擬語氣。句意：—你認(rèn)為美國歌手 Lady Gaga 的表演怎么樣?—太瘋狂了，但是如果她能到中國來舉行演唱會的話，我會買票看她現(xiàn)場演出。由語境可知，此處是 if 引導(dǎo)的虛擬條件句，敘述與將來事實相反，從句用 should do/過去式/were to do，主句用 would/could/should/might do，故C項正確。

　　[答案]C

　　34.Without Sir Tim, the father of the WWW, keeping up with the latest ________ so convenient.

　　A. would be B. wouldn't be

　　C. would have been D. wouldn't have been

　　[解析]本題考查虛擬語氣。句意：若沒有萬維網(wǎng)之父 Tim 先生，跟得上最新信息就不會這么方便了。由語境可知，Without Sir Tim 為含蓄條件句，相當(dāng)于 If there were not Sir Tim，敘述與現(xiàn)在事實相反，故主句謂語動詞用“would/should/could/might+do”，故B項正確。

　　[答案]B

　　35.Look at the trouble I am in! If only I ________ more careful when driving.

　　A. was B. would be

　　C. had been D. should be

　　[解析]本題考查虛擬語氣。句意：瞧瞧我的麻煩!要是我開車時小心點兒就好了!if only“但愿……，要是……就好了”，后接從句，從句謂語動詞用虛擬語氣，敘述與過去事實相反，謂語動詞用 had done，故C項正確。

　　[答案]C