问题补充：
It have rained last night, for the ground is wet.
A. may
B. should
C. will
D. must
答案：
A. may
B. should
C. will
(答案→)D. must
解析： 句意：昨晚肯定下雨了，因为地面是湿的。Must have done肯定做了某事。所以选D。
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