问题
选择题
------You are leaving for Beijing Please send me a postcard _________ you are there.
------No problem.
A．if
B．while
C．although
D．because
答案
答案：B
题目分析：句意：你将要去北京，你在北京期间请邮寄给我一张明信片。分析是你在北京的时候，也就是指在北京期间，故选B
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