题目内容
【题目】I got up early this morning,but I ________ so because I was not on duty today.
A.mustn’t have done B.needn’t have done
C.didn’t need to do D.can’t have done
【答案】B
【解析】
试题分析:考查情态动词。句意:早晨我起得很早,但是我本没必要这么做,因为我今天不值班。needn’t have done本没必要做某事。故选B。
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