◎ 题干
---- 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
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“---- I wonder how much you charge for your services. ---- The first two are free ____ the third costs $30.A.whileB.untilC.whenD.before…”主要考查了你对  【并列连词】【从属连词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。