【題目】He had known the matter before you told him, so you _________ have told it to him.

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

【答案】C

【解析】

考查情態(tài)動(dòng)詞。句意：在你告訴他之前他已經(jīng)知道了這件事，因此你本不必要告訴他的。A. mustn't不必；B. can't不能；C. needn't不需要；D. shouldn't不應(yīng)該。根據(jù)句意可知， 表示不必要而做了做的事，needn't have done 表“本來(lái)不必要做某事卻做了（對(duì)過(guò)去的虛擬）”，故選C。

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