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Look! The ground is wet. It must have rained last night, ________?
A.hasn't itB.hadn't it
C.mustn't itD.didn't it
D
D 考查反意疑问句。句意:看!地是湿的。昨晚一定下过雨,是不是?It must have rained last night是推测语气,可改写为I think it rained last night,可见其反意疑问部分应为didn't it,故选D项。
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