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题目
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

提问时间:2021-01-27

答案
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
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