33.They are trying to make sure that 5G terminals_________ by 2022 for the Beijing Winer Olympics.

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

【答案】B

【解析】

软学点854673014068广升技有秀a343优ae6265cc限896a9bb5途-804daf53是学学司元件术学0851东秀科法网984f公慧【详解】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。