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 studyB为什么不对](/uploads/image/z/10604980-28-0.jpg?t=i+got+up+early+that+morning%2Cbut+i__so+because+i+had+no+work+to+do.A.mustn%27t+have+done+B.didn%27t+need+to+do+C.needn%27t+have+done+D.must+have+to+studyB%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E5%AF%B9)
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
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
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
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