问题描述：
分析一个非谓语动词的句子
I t happened to be raining when i got there.
我想问一下这是个什么从句?it happened to be raining又是什么从句?
I t happened to be raining when i got there.
我想问一下这是个什么从句?it happened to be raining又是什么从句?
问题解答：
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