问题描述：
I am going to Qingdao and stay there for a week.
____you are there,would you please buy some books for me?
A.ifB.whileC.sinceD.as soon as
为什么不用A
____you are there,would you please buy some books for me?
A.ifB.whileC.sinceD.as soon as
为什么不用A
问题解答：
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