i wasn`t sure when it ______(rain).要怎么填.为什么?

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i wasn`t sure when it ______(rain).要怎么填.为什么?
i wasn`t sure when it ______(rain).要怎么填.为什么?

i wasn`t sure when it ______(rain).要怎么填.为什么?
would rain/was gonna rain
was表示过去时,所以要用过去形式