The ground is all wet. It _________ last night.
A．can’t have rainedB．may have rainedC．can have rainedD．must have rained
D
考查情態(tài)動詞表推測。時間是last night，所以要用情態(tài)動詞加完成時態(tài)表對過去事實的推測。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測，排除C；所以選D，must have rained肯定下雨了，把握性很大，符合句意。
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