B
本题考查反义疑问句。I’m sure it must have rained last night, ________?
主句主语为I，所以对从句反问，it must have rained last night，有具体的过去时间last night，所以用一般过去式didn’t it 。如果没有具体的过去时间，则用完成时hasn’t it。所以选B。
The ground is wet all over, so I’m sure it must have rained
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