You look very tired.You____late last night.

问题描述:

You look very tired.You____late last night.
A.needn't sit up B.didn't need to sit up C.shouldnt sit up D.needn't have sat up
坑爹的答案是D

you must have stayed up late last night.
在我看来,一个答案都不对.为啥为啥?must have done "肯定是做过什么事"如果表示原本不必这样做, 用shouldn't have done 更好吧呵呵, 参考