There is no light in the dormitory．They must have gone to the lecture, ________?
A.didn't theyB.don't theyC.mustn't theyD.haven't they在线课程D
must be或must +不定式的完成式是用来表示推测时,反意疑问句的简短问句不能重复must，答案为D.例如：He must be in the reading-room, isn't he?他一定在阅览室里，是不是?
They must have seen the film，haven't they?想必他们一定看了电影，是不是?
You must have lost the book，haven't you?想必你丢了书，对吗?如果陈述句部分中有一个肯定的过去时间状语，须用didn't.例如：They must have visited the Palace Museum yesterday，didn't they?他们昨天去参观故宫了，对吗?
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