(2013·甘肅河西五市二模)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　考查反意疑問句。句意：看！地是濕的。昨晚一定下過雨，是不是？It must have rained last night是推測語氣，可改寫為I think it rained last night，可見其反意疑問部分應為didn't it，故選D項。
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