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    精英家教网 > 高中英语 > 题目详情
    --- I wonder how much you charge for your service.
    --- The first two are free ______ the third costs $30.
    A．whileB．untilC．whenD．before
    A
    考查连词。While 意为然而，表对比， until直到  when当……时候  before在之前
    句意为，---我想知道你的服务要收多少钱？
    -----前面两个免费，然而第三个要三十美元。
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