i got up early that morning,but i__so because i had no work to do.A.mustn't have done B.didn't need to do C.needn't have done D.must have to studyB为什么不对

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i got up early that morning,but i__so because i had no work to do.
A.mustn't have done B.didn't need to do C.needn't have done D.must have to study
B为什么不对

因为后面有"because I had no .."
所以前后还有时间上的距离,即我起床,然后没有事情做
因此要用完成时态

前半句是过去时态,说明动作已经发生,后面应该用虚拟语气 选C
翻译是,我那天早上起得很早,但是我本不需要这样做,因为我没有工作可以做

选C
needn't have done 本来不必做某事[但已经做了]
而B.didn't need to do 表示“(过去某时)不必做某事”,根据题意,应该选C

needn't have done“表示本来不必做某事而实际上做了某事”。
didn't need to do表示: 过去不必做某事, 事实上也没做

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