组卷网 > 高中英语综合库 > 单词辨析 > B > before
题型:单项选择 难度:0.4 引用次数:399 题号:1139170
—I wonder how much you charge for your services.
—The first two are free, _______ the third costs $30.
A.whileB.untilC.whenD.before
2009·安徽·高考真题 查看更多[8]
【知识点】 before 并列连词解读

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