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______ some users of the smart watches f...

______ some users of the smart watches for two years, they draw a conclusion that it is necessary to renew the software.

A.Following B.To follow C.Followed D.Having followed

 

D 【解析】 考查时态及非谓语动词。句意:在对一些智能手表用户进行了两年的跟踪调查后,他们得出结论:有必要更新该软件。follow some users of the smart watches(对一些智能手表用户进行跟踪调查)这件事发生在draw a conclusion(得出结论)之前,因此要使用现在完成时,表示过去的动作或状态持续到现在并且已经完成,对现在造成的影响。又因为follow(跟踪)在句中作非谓语,这个动作与其逻辑主语they之间是主动关系,因此使用have followed的现在分词形式。故填Having followed。故选D项。
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