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英语:You must have missed the train last week ,( )?

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英语:You must have missed the train last week ,( )?
英语:You must have missed the train last week ,( )?
1.mustn't you 2.haven't you 3.didn't you 4.needn't you
答案是C
什么其他的不行啊 请分别解释一下吧
3Q
英语:You must have missed the train last week ,( )?
① 当陈述部分为I think (believe, suppose) that...等时,疑问部分通常与从句保持一致(注意否定的转移):
I think that it is too short, isn’t it? 我认为它太短了,对不对(它太短吗)?
I don’t think he will come, will he? 我认为他不会来,对吗(他会来吗)?
② 由①可知此处的反意疑问句应与从句保持一致,would have done表示对过去情况的推测,且有明显的时间状语 last night, 故用过去时 didn't you .
如果还不了解就Hi我吧.