问题描述：
i am going to the post office you're there can you get me some stamp
_-----i am going to the post offic
-----_____you're there .can you get me some stamps?
A for B while C as D because
说明下为什么,
_-----i am going to the post offic
-----_____you're there .can you get me some stamps?
A for B while C as D because
说明下为什么,
问题解答：
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