Since the ditch is full of water, ______last night.

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问题 Since the ditch is full of water, ______last night.

选项 A、it must raining
B、there might have rain
C、it must have rained
D、there might have been rain

答案C

解析 “情态动词加现在完成时”,表示对过去发生情况的推测。
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