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    　　　e-commerce worries some merchants, it contributes to the development of delivery industries.

    A. WhenB. UnlessC. WhileD. Until

     

    【解析】选C。考查状语从句。句意: 尽管电子商务使很多商人担心, 但是它却促进了快递业的发展。while此处意为“尽管”, 引导让步状语从句, 一般放在句首。

     

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