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--- Have you told him we have changed the plan?
I _____ have, but I haven’t done it yet.

A.mustB.ought toC.needn’tD.can’t

B

解析試題分析:考察情態動詞用法。A必須,一定;B應該;C不必;D不可能;ought to have done本應該做某事,實際上卻做未。Must have done一定做了某事;needn’t have done本不需要做某事,實際上卻做了。句意:—你告訴他我們改變計劃了嗎?—我本應該告訴他,但是我還沒有告訴他呢。根據句意說明B正確。
考點:考察情態動詞用法
點評:本題是高考必考考點,一定要牢記句型意思。must have done過去肯定做了某事。should have done 本應該做而實際未做。can’t have done 過去不可能做了某事;shouldn’t have done 本不應該做而實際做了。 need have done 本有必要做某事;needn’t have done 本沒有必要做某事;注意沒有 mustn’t have done的形式。

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