【題目】—I wonder how much you charge for your services.

—The first two are free _____ the third costs $30.

A. while B. until C. when D. before

【答案】A

【解析】試題解析：

while:表轉(zhuǎn)折 “而, 然而”句意:前兩份免費(fèi),而第三份要$30。故選A

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