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Mr Jiang _______ the company to develop ...

Mr Jiang _______ the company to develop the 5G network for years. Now he works as the chief engineer in it.

A.joined B.was a member of

C.has joined D.has been a member of

 

D 【解析】 句意:江先生作为该公司的一员多年来一直致力于5G网络的开发。现在他在这家公司任总工程师。 考查动词时态。joined加入,一般过去时;was a member of是……一员,一般过去时;has joined已经加入,现在完成时;has been a member of已经成为……一员,现在完成时。根据语句中for years及语境可知,本句为现在完成时态,故排除A、B两选项。join为瞬时性动词,不能在现在完成时中与时间段连用;be a member of为延续性动作,可在现在完成时中与时间段连用,故此处应为has been a member of即多年来作为公司的一员。故选D。  
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