They must have stayed at hotel last night, ______?A、mustn’t theyB、haven’t they

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问题 They must have stayed at hotel last night, ______?

选项 A、mustn’t they
B、haven’t they
C、didn’t they
D、hadn’t they

答案 C

解析反意疑问句题。must have stayed表示对过去的猜测，因此反意疑问句部分，用助动词did。因此答案为C。

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Theystayeduplatetryingto______outawaytosolvetheproblem.A、letB、give