10.(2013·四川高考)—Why are your eyes so red? You________have slept well last night.
—Yeah, I stayed up late writing a report.
A.can't B.mustn't
C.needn't D.won't
答案：A 考查情態(tài)動(dòng)詞的用法。句意：——你的眼為什么那么紅?昨晚你肯定沒(méi)睡好。——是的，我熬夜寫(xiě)一篇報(bào)道了。A項(xiàng)can't have done表示對(duì)過(guò)去的否定推測(cè);B項(xiàng)表示“禁止，不允許”，不能用于對(duì)過(guò)去的推測(cè);C項(xiàng)needn't have done表示過(guò)去不需要做某事(但卻做了);D項(xiàng)不能用于對(duì)過(guò)去的推測(cè)。由句中的“so red”及時(shí)間狀語(yǔ)“l(fā)ast night”提示，此處強(qiáng)調(diào)對(duì)過(guò)去發(fā)生動(dòng)作的否定推測(cè)。
11.(2010·天津，9)Mark ________ have hurried. After driving at top speed, he arrived half an hour early.
A.needn't B.wouldn't
C.mustn't D.couldn't
答案：A 考查情態(tài)動(dòng)詞。句意：邁克本來(lái)不必那么匆忙的。這么高速駕駛之后，他提前半個(gè)小時(shí)到達(dá)了。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needn't have done結(jié)構(gòu)，表示“本來(lái)不必做某事而實(shí)際上做了”。
12.(2011·全國(guó)卷Ⅰ，32)They ________ have arrived at lunchtime but their flight was delayed.
A.will B.can
C.must D.should
答案：D 考查虛擬語(yǔ)氣的用法。句意為：他們本該午飯時(shí)到達(dá)，但他們的航班推遲了。will have done將來(lái)可以完成;can have done可能做過(guò)……嗎?表示對(duì)過(guò)去行為的懷疑，用于疑問(wèn)句;must have done一定做過(guò)某事，表示對(duì)過(guò)去事情的肯定推測(cè);should have done本來(lái)應(yīng)該做某事，而實(shí)際沒(méi)做。but their flight was delayed這樣的結(jié)果，說(shuō)明他們本來(lái)該到達(dá)卻沒(méi)有到達(dá)，因此選D。
13.(2012·湖南，21)We've had a good start, but next, more work needs________ to achieve the final success.
A.being done B.do
C.to be done D.to do
答案：C 考查情態(tài)動(dòng)詞的用法。need既可用作情態(tài)動(dòng)詞也可用作實(shí)義動(dòng)詞，在本句中用作實(shí)義動(dòng)詞故排除B項(xiàng);need后可接動(dòng)名詞的主動(dòng)式表被動(dòng)含義，若選A項(xiàng)，則需改為doing，need doing=need to be done, 故C項(xiàng)正確。
14.(2012·新課標(biāo)，30)I ________ use a clock to wake me up because at six o'clock each morning the train comes by my house.
A.couldn't B.mustn't
C.shouldn't D.needn't
答案：D 本題考查情態(tài)動(dòng)詞。句意：我沒(méi)有必要用鬧鐘來(lái)叫醒自己因?yàn)槊刻煸缟狭c(diǎn)火車從我家旁邊經(jīng)過(guò)。couldn't意為“不能，不可能”; mustn't意為“不允許，禁止”; shouldn't意為“不應(yīng)該”; needn't意為“不必”，符合語(yǔ)境，故D項(xiàng)為正確選項(xiàng)。
15.(2010·湖南，23)You ________ buy a gift, but you can if you want to.
A.must B.mustn't
C.have to D.don't have to
答案：D 考查情態(tài)動(dòng)詞的用法。句意：你沒(méi)有必要買禮物，但如果你想買的話，你也可以買。don't have to意為“沒(méi)有必要”，符合語(yǔ)境。故選D。
