D
前面的if作“是否"解释,相当于“whether",引导的从句改用什么时态就用什么时态；后面的if作”如果“解释,引导条件状语从句,而条件状语从句中要用一般现在时表将来,所以是rains.
They don't know if it ___ tomorrow.If it ___,they will not g
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