◎ 题干
There's no light on in the dormitory. They must have gone to attend the concert to be held on the
campus, ________?
[     ]
A. didn't they  
B. mustn't they
C. haven't they  
D. shouldn't they
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“There's no light on in the dormitory. They must have gone to attend the concert to be held on the campus, ________?[ ]A. didn't theyB. mustn't theyC. hav…”主要考查了你对  【反意疑问句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。