问题描述：
——I am going to the post office.—— ＿＿you are there,can you get me some stamps?A.
——I am going to the post office.
—— ＿＿you are there,can you get me some stamps?
A.As B.While C.Because D.If
——I am going to the post office.
—— ＿＿you are there,can you get me some stamps?
A.As B.While C.Because D.If
问题解答：
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