We shall go to Shanghai on business before you__back next week .Awill come B came Cwould comeDcome我要解释

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We shall go to Shanghai on business before you__back next week .Awill come B came Cwould comeDcome我要解释

We shall go to Shanghai on business before you__back next week .Awill come B came Cwould comeDcome我要解释
We shall go to Shanghai on business before you__back next week .Awill come B came Cwould come
Dcome我要解释

We shall go to Shanghai on business before you__back next week .Awill come B came Cwould comeDcome我要解释
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”.

D

选 D before 引导的时间状语从句,适用于主将从现规则,即主句用一般将来时态,从句用一般现在时态。