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They are trying to make sure that 5G ter...

They are trying to make sure that 5G terminals ________ by 2022 for the Beijing Winter Olympics.

A.will install B.will have been installed C.are installed D.have been installed

 

B 【解析】 考查时态和语态。句意:他们正努力确保在2022年北京冬奥会之前安装5G终端。表示在将来某一时间以前已经完成或一直持续的动作,用将来完成时;“5G终端”和“安装”之间是被动关系,用被动语态,故选B。  
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