Since the ground is wet, it ______ last night.A、must have rainedB、had rainedC、

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问题 Since the ground is wet, it ______ last night.

选项 A、must have rained
B、had rained
C、must rain

答案 A

解析此题考查情态动词的用法。must have done表示对过去某事的推测。

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