Question

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

Answer

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。