题目内容

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

[　　]

A．didn't they
B．don't they
C．mustn't they
D．haven't they
答案：D
解析：

本题考查must have＋过去分词表推测时的反意疑问句的形式。根据题干的后一部分的句子结构，可知是对过去的推测，因无时间状语，故选D。表示推测的句子变反意疑问句需注意以下两种情形。一表示对过去的推测，变反意疑问句时，若无确切的过去时间状语，用haven't／hasn't＋主语来进行反问；若带有时间状语时，用didn't＋主语来进行反意疑问。二是当must be表示对现在的肯定推测时，变反意疑问句使用isn't＋主语（单数），aren't＋主语（复数）。


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