what would you do if it ___tomorrow?we have to carry it on ,since we've got everything ready.A rainB rainsC will rain D is raining为什么不用rain原型

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what would you do if it ___tomorrow?we have to carry it on ,since we've got everything ready.A rainB rainsC will rain D is raining为什么不用rain原型
what would you do if it ___tomorrow?we have to carry it on ,since we've got everything ready.
A rain
B rains
C will rain
D is raining
为什么不用rain原型

what would you do if it ___tomorrow?we have to carry it on ,since we've got everything ready.A rainB rainsC will rain D is raining为什么不用rain原型
因为it是单数,而rain在单数的变位就是rains~~
且虽然明天是将来时,但是在if 引导的从句后表示一个一般的情况条件,所以用rains~~

B
if引导的条件句主将从现

B 条件句,从句用一般现在时就行,it做主语当然用rains