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—Mary broke up with me!
—You _____ have forgotten about the Valentine's Day.

A.shouldn'tB.couldn'tC.needn'tD.mustn't

A

解析试题分析:考查情态动词用法。“情态动词+have done”既可以表示对过去情况的推测,也可以表示对过去所发生情况的虚拟。有一些固定搭配:Shouldn’t have done本不应该做某事,实际上却做了;couldn’t have done不可能做了某事;needn’t have done本不必做某事,实际上却做了;句意:—Mary和我分手了!—你本不应该忘记这个情人节的!根据句意说明A正确。
考点:考查情态动词用法
点评:本题是高考必考考点,一定要牢记句型意思。must have done过去肯定做了某事。should have done 本应该做而实际未做。can’t have done 过去不可能做了某事;shouldn’t have done 本不应该做而实际做了。 need have done 本有必要做某事;needn’t have done 本没有必要做某事;注意没有 mustn’t have done的形式

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