题目内容

The ground is all wet. It _________ last night.
A．can’t have rainedB．may have rainedC．can have rainedD．must have rained
D
考查情态动词表推测。时间是last night，所以要用情态动词加完成时态表对过去事实的推测。can’t have rained表不可能下雨，和前一句矛盾，排除A；may have rained可能下雨了，把握性不大，和前一句不符，排除B；can不能用于肯定句表推测，排除C；所以选D，must have rained肯定下雨了，把握性很大，符合句意。
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