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    【题目】Since its start, WeChat ______into the most popular messaging communication service in China.

    A. has developed B. developed

    C. develops D. was developing

    【答案】A

    【解析】

    试题分析：考查时态。本句的时间状语是since its start，自从它开始以来，“since结构”在句中作时间状语，主句通常使用现在完成时，故A正确。

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