用括号中所给单词的适当形式完成句子The road is wet.It must be

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rainy happened
======以下答案可供参考======
供参考答案1:
The road is wet. It must be_ rain _(rain)last night.
I'm not sure when it_ happened _(happen)
供参考答案2:
rained
happened
供参考答案3:
　　have rained；is happened