—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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