2. 公务员
  3. —I wonder how much you charge for your services. —The first two are free______the third costs $30.

—I wonder how much you charge for your services. —The first two are free______the third costs $30.

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问题 —I wonder how much you charge for your services. —The first two are free______the third costs $30.
选项 A、while
B、until
C、when
D、before
答案A
解析 while有“而，然而”的意思，用于对比；until表示“到……为止，直到…… 才”；when表示“当时”；before表示“在……之前。句子意思是：前面两项服务是免费的，而第 三项收费30美元。句子有前后句对比的意思，表示“而”。故选A。
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