【題目】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】

試題分析：考查時態(tài)。本句的時間狀語是since its start，自從它開始以來，“since結(jié)構(gòu)”在句中作時間狀語，主句通常使用現(xiàn)在完成時，故A正確。

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