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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．beforeB．asC．whenD．while
    D
    连词辨析。Before在……之前；as 因为，尽管；when当……时候；while
    然而，表前后对比。句子是说前两个免费而第三个30美元。表示前两个和第三个对比，所以选D。
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