问题
选择题
The ground is wet. It must have rained last night, _____ it?[ ]
A. hasn't
B. mustn't
C. didn't
D. hadn't
答案
答案：C
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The ground is wet. It must have rained last night, _____ it?[ ]
A. hasn't
B. mustn't
C. didn't
D. hadn't
答案：C