【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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