We shall go to Shanghai on business before you__back next week .Awill come B came Cwould come
问题描述：
We shall go to Shanghai on business before you__back next week .Awill come B came Cwould come
Dcome我要解释
答
当主句是一般将来时的时候,时间状语从句或条件状语从句要用一般现在时.简称“主将从现”.