题目内容

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可知此处是对过去情况的猜测，下雨是过去的事实，所以反意疑问句的助动词用did，并且根据前肯后否的原则，反意疑问句应该用否定形式，C项正确。句意为：看！地面湿了，昨天晚上肯定下雨了，不是吗？
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