If it tomorrow I will stay at home and do some cleaning.A. will rainB. rainsC. is rainin

问题补充：

If it tomorrow, I will stay at home and do some cleaning.

A. will rain

B. rains

C. is raining

D. is going to rain

答案：

A. will rain

(答案→)B. rains

C. is raining

D. is going to rain

解析：if引导的条件状语从句，从句用一般现在时，主句用一般将来时。