问题
选择题
It _____ last night, for the ground is wet. [ ]
A. must rain
B. must have rained
C. must be raining
D. can't have rained
答案
答案：B
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It _____ last night, for the ground is wet. [ ]
A. must rain
B. must have rained
C. must be raining
D. can't have rained
答案：B