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as 和while题,

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as 和while题,
I'm going to the post office
__________you are there,can you get me some stamps?
A as
B while
AS也有当的意思,那为什么选D呢.
as 和while题,
as 和 while 都有 “当“的意思
while 用在时间和地点
as 用在原因.等
while you are there
as you are going there