I’m waiting for Jack ________, I will go swimming alone.选择题

问题描述:

I’m waiting for Jack ________, I will go swimming alone.选择题
A. If he doesn’t comeB. If he won’t come
C. If he will come D. If he is coming
并说出为什么选择这个答案

选A,条件状语从句,主句用一般将来时从句就用一般现在时