as 和while题,I'm going to the post office__________you are there,can you get me some stamps?A asB whileAS也有当的意思,那为什么选D呢.

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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 asB whileAS也有当的意思,那为什么选D呢.
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,I'm going to the post office__________you are there,can you get me some stamps?A asB whileAS也有当的意思,那为什么选D呢.
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

as 有正当...时候的意思
while表示正在发生

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while 后面接延续性行为，但这个动作肯定和主句动作时间不一样长。如：he was talking to me while he was watching the tv。应该说“看电视”比“谈话”时间长。而as通常两个动作一直相随，很可能时间相同。如：he was thinking of a question as watching the tv。这两个动作就是一直相随的。
as意为“一边……一边……”或“与……同时”，重在表示动作同时发生、伴随进行。while只指“时间段”，不指“时间点”，从句的动词只限于持续性动词。
1 从句表示"随时间推移"连词能用as，不用while。
As the day went on, the weather got worse.
日子一天天过去，天气越变越坏。
2 as引导短暂性动作的动词。
Just as I stopped my car, a man came up to me.

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AS ，while一般接ing形式

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