2. 外语
  3. There is no light in the dormitory. They must have gone to the lecture, ______ ?

There is no light in the dormitory. They must have gone to the lecture, ______ ?

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问题 There is no light in the dormitory. They must have gone to the lecture, ______ ?
选项 A、didn’t they
B、don’t they
C、mustn’t they
D、haven’t they
答案D
解析 在带情态动词的反意疑问句中，后面的疑问词直接用情态动词后面的词进行否定。
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