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

题目

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

答案

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.