—Mary broke up with me!
—You _____ have forgotten about the Valentine's Day．
A．shouldn'tB．couldn'tC．needn'tD．mustn't
A

試題分析：考查情態(tài)動詞用法。“情態(tài)動詞+have done”既可以表示對過去情況的推測，也可以表示對過去所發(fā)生情況的虛擬。有一些固定搭配：Shouldn’t have done本不應(yīng)該做某事，實際上卻做了；couldn’t have done不可能做了某事；needn’t have done本不必做某事，實際上卻做了；句意：—Mary和我分手了！—你本不應(yīng)該忘記這個情人節(jié)的！根據(jù)句意說明A正確。
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(yīng)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(yīng)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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