灵鹊做题网请教：He must have stayed up late last night,_____? A.didn't he
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请教：He must have stayed up late last night,_____? A.didn't he B.hasn't he C.mustn't he D.needn't he 正确答案是A,为什么?请详解
这句话是推测过去发生的事情, 所以这句话其实就是一个过去式的句子. 如果说说这句话的人对这件事很肯定,他可以说：He stayed up late last night, didn't he? 说了 He must have stayed up last night, didn't he? ...
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