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    【题目】Some people get in touch with each other by mobile phones__________ others keep contact with each other by e-mail.

    A. when B. before C. while D. since

    【答案】C

    【解析】考查连词：A. when当…时候B. before在…之前C. while当…时候，然而，虽然，D. since既然，句意：一些人通过手机彼此联系，然而一些人通过电子邮件联系。选C。

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