I don't know whether it will rain or not,but if it____(do),I shall stay at home.

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I don't know whether it will rain or not,but if it____(do),I shall stay at home.
I don't know whether it will rain or not,but if it____(do),I shall stay at home.

I don't know whether it will rain or not,but if it____(do),I shall stay at home.
does

does

应该填does因为这是一个条件状语从句主将从现