I will stay at home and read books if it tomorrow.A. is rainingB. rainsC. rainD. will rai

问题补充：

I will stay at home and read books if it tomorrow.

A. is raining

B. rains

C. rain

D. will rain

答案：

A. is raining

(答案→)B. rains

C. rain

D. will rain

解析：考查if的用法。句意“如果明天下雨，我将待在家里看书。”if引导条件状语从句时，意为“如果”，用一般现在时代替一般将来时。It是第三人称，故用单数。故选B。