Since the road is wet this morning,---------last night.A it must rain B it must have rainde C it must be raining D it must have been raining 选什么 为什么

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Since the road is wet this morning,---------last night.
A it must rain B it must have rainde C it must be raining D it must have been raining
选什么 为什么

B it must have rained
情态动词肯定推测句
因为这条路很湿,昨晚一定下雨了

B
今天早上路上是湿的,说明昨晚肯定下过雨
must have done表示肯定推测