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题目内容
（大连工业大学-大学英语2）
(单选题) There is no light in the dormitory. They must have gone to the lecture, _____?(本题3.0分)
A、 didn.t they
B、 don.t they
C、 mustn.t they
D、 haven.t they
A、 didn.t they
B、 don.t they
C、 mustn.t they
D、 haven.t they
参考答案