--I'm going to the post office.--you're there can you get me some postcards?A. As　B. Whil

问题补充：

--Im going to the post office.

--you e there, can you get me some postcards?

A. As

B. While

C. Because

D. If

答案：

A. As

(答案→)B. While

C. Because

D. If

解析：while 表示利用机会，翻译成 趁……时