There is no light in the dormitory．They must have gone to the lecture, ? [ ] A．d
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![There is no light in the dormitory．They must have gone to the lecture, ? [ ] A．d](/pic/43_952111.jpg)
There is no light in the dormitory．They must have gone to the lecture, ________?
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A．didn't theyB．don't theyC．mustn't theyD．haven't they
试题答案
答案：D
解析：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? |