Thereisnolightinthedormitory．They

发布时间：2020-07-09 21:50:38

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

网友回答

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，
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