Question

请教：He must have stayed up late last night,_____?

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

Answer 1

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? 只不过想表示猜测而已。

麻烦采纳，谢谢!