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单选题
The rescue team must have searched for the missing visitors two days ago, _____?
A

mustn’t they

B

haven’t they

C

didn’t they

D

hadn’t they

参考答案

参考解析
解析：
当陈述部分出现must have done时，若强调对过去情况的推测（一般有过去时间状语），反意疑问部分的谓语动词用didn’t+主语；若前句强调动作的完成，疑问部分谓语动词用haven’t/ hasn’t+主语。本句有明显的时间状语two days ago，故选C。
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