Look！The ground is wet.It must have rained last night，________？
A．hasn’t itB．didn’t it
C．mustn’t itD．hadn’t it
B

由last night及must have rained可知此處是對過去情況的猜測，下雨是過去的事實，所以反意疑問句的助動詞用did，并且根據(jù)前肯后否的原則，反意疑問句應(yīng)該用否定形式，C項正確。句意為：看！地面濕了，昨天晚上肯定下雨了，不是嗎？
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