-–Iwonderhowmuchyouchargeforyourservices.---Thefirsttwoarefree

发布时间：2020-08-13 03:40:09

-– I wonder how much you charge for your services.--- The first two are free         the third costs $30A.whileB.untilC.whenD.before

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A解析While这里表示对比关系。这里考查连词引导的状语从句。
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