if引导的条件状语从句,如果主句是一般现在时,从句用什么时态?

问题描述:

if引导的条件状语从句,如果主句是一般现在时,从句用什么时态?
--I don't know if his father____.
____I think he _______if it doesn't rain.
A.will come;comesB.will come;will come
C.comes;comesD.comes;will come

主句是一般现在时,从句用一般将来时
选B