题目内容：

if的用法,英语选择题辨析,
-- I don't know if she__________.
-- She'll come here if it_______.
A.comes;won't rain
B.comes;doestn't rain
c.will come; won't rain
d.will come;doesn't rain
请问在这里if什么时候后面加一般现在时,什么时候加will?