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lookedsotiredthismorning.He（）latelastnight.A.muststayupB.musthavestayedupC.wasstayingupD.hasstayedup
题目内容：
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?优质解答
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~
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?
优质解答
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