---I was trying to carry out the plan, but I failed.
---Well, you _____, for we were uncertain it would do ____.
A.needn’t do that, in factB.needn’t have done, in effect
C.needn’t have, in practiceD.needn’t, in time
C

試題分析:句意:我正盡力的實(shí)施這個(gè)計(jì)劃,但是我失敗了。你本不必這樣做的,因?yàn)槲覀儾淮_定在實(shí)踐中它是否有效。needn’t have done sth本不必做某事,而實(shí)際做了。
in practice在實(shí)踐中   in fact實(shí)際上。故選C
點(diǎn)評:情態(tài)動(dòng)詞+ have done 是高考語法重點(diǎn):
(1) should (not) / ought (not) to have done本(不)應(yīng)該做某事,但卻沒有做或做了,含有責(zé)備或后悔之意。
(2) could have done本來能夠做某事但未做。
(3) needn’t have done本沒有必要做某事但卻做了。要注意needn’t do則表達(dá)“沒有必要去做某事”,時(shí)間上應(yīng)該是現(xiàn)在或?qū)怼?br />(4)would (not) have done本來(不)會(huì)發(fā)生某事,但卻(發(fā)生了)或沒有發(fā)生。常用于虛擬條件句或含蓄虛擬條件引導(dǎo)的虛擬語氣,表示對過去所發(fā)生事情結(jié)果的假設(shè)。
(5) might have done表示“本來可能……”,但實(shí)際上沒有發(fā)生的事。
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