looked so tired this morning.He（ ）late last night.
A.must stay up
B.must have stayed up
C.was staying up
D.has stayed up
选哪个呢?可以选A吗?为什么?
人气：399 ℃ 时间：2020-01-26 00:22:30
解答
选B啊~A不行的,must do表示一定要做什么,must have done是一定做过什么,stay up肯定是做过了所以才会tired的~
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