Question

一道英语题 he must have stayed up late night,__he?

A mustn't B needn't C hasn't D didn't
总是搞不清楚该用什么，请帮忙讲解下，谢谢~

Answer 1

D
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。

若无 last night ,选C；若有，那主要看靠近的，last night 是过去时，所以选D

这句话是对过去的推测，意思是他昨晚一定熬夜了，反意疑问句应用一般过去时。

如果满意，请记得 点击本页面中的“选为满意回答”按钮，(*^__^*) 谢谢~~

追问

什么时候用mustn't 回答？

追答

Mustn't是禁止的意思。没有这种用法

Answer 2

你好，很高兴为你解答
he must have stayed up late night,__he?
A mustn't B needn't C hasn't D didn't
答案：D
must have done :对过去的肯定推测，所以这里要用didn't
对已发生的过去情况的推测，若陈述句谓语部分有“must have
done”，而且有表示过去的时间状语，问句部分用didn't；若没有表示过去的时间状语，问句部分用haven't或hasn't。如：
1)They must have gone there last night,didn't they?
2)They must have arrived by now,haven't they?（根据by now来判断）
3)They must have been to the Great Wall,haven't they?

谢谢
希望采纳

追问

什么时候用mustn't 回答？