请教He must have stayed up late last night
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
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。
答：因为go to bed仅指上床睡觉的动作 go to sleep是指入睡，睡着，是go to bed以后才能进入的状态 根据题中I'm very sleepy ...详情>>
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