----This is for you.
----You____have!I do not know how to thank you.
A．must notB．couldn´tC．needn’t D．shouldn’t
D

試題分析：情態(tài)動詞用法。Must not禁止，千萬不能；couldn’t have done不可能做某事；needn’t heve done本不需要做某事，實(shí)際上卻做了；shouldn’t have done本不應(yīng)該做某事，實(shí)際上卻做了。句意：—這是給你的。—你本不應(yīng)該給我的。我不知道該怎么感謝你。故D正確。
點(diǎn)評：本題是高考必考考點(diǎn)，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(yīng)該做而實(shí)際未做。can’t have done 過去不可能做了某事；shouldn’t have done 本不應(yīng)該做而實(shí)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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