—I’m going to the post office.—you’re there can you buy me some stamps?A. BecauseB. While

问题补充：

—I’m going to the post office.

—you’re there, can you buy me some stamps?

A. Because

B. While

C. As

D. If

答案：

A. Because

(答案→)B. While

C. As

D. If

解析：考查连词：句意：--我要去邮局。如果你在那里，你可以帮我买些邮票吗？而D表示如果你在那里，while表示当…时候，表示“一段时间”所以选B。