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1 . They are trying to make sure that 5G terminals        by 2022 for the Beijing Winter Olympics.
A.will be installedB.will have been installed
C.are installedD.have been installed
2020-09-13更新 | 181次组卷 | 1卷引用:2021届广东省广州市高三上学期8月执信、广雅、六中三校联考英语试题
共计 平均难度:一般