They are trying to make sure that 5 G terminals will have been installedbeen installed （install） by 2022 for the Beijing Winter Olympics.
【考點】將來完成時的被動語態．
【答案】been installed
【解答】
【點評】
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發布：2024/12/12 3:30:1組卷：5引用：1難度：0.6
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