问题补充：
Look! The ground is wet. It must have rained last night, ？
A. hasn it
B. hadn it
C. mustn it
D. didn it
答案：
A. hasn it
B. hadn it
C. mustn it
(答案→)D. didn it
解析：D考查反意疑问句。句意：看！地是湿的。昨晚一定下过雨，是不是？It must have rained last night是推测语气，可改写为I think it rained last night，可见其反意疑问部分应为didn it，故选D项。
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