I am going to Qingdao and stay there for a week.

问题描述:

I am going to Qingdao and stay there for a week.
______ you are there,would you please buy some books for me?
A.If B.While C.Since D.As soon as
我选择的是A ...
为什么不是A呢,不是虚拟语气吗?

B
表示一段时间