问题
选择题
While ________ as a volunteer at the Beijing Olympics, she made friends with the famous tennis player.[ ]
A．being served
B．serving
C．having served
D．served
答案
答案：B
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While ________ as a volunteer at the Beijing Olympics, she made friends with the famous tennis player.[ ]
A．being served
B．serving
C．having served
D．served
答案：B