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

A. will installB. will have been installedC. are installedD. have been installed

【答案】B

【解析】

考查時(shí)態(tài)和語態(tài)。句意:他們正努力確保在2022年北京冬奧會之前安裝5G終端。表示在將來某一時(shí)間以前已經(jīng)完成或一直持續(xù)的動(dòng)作,用將來完成時(shí)!5G終端”和“安裝”之間是被動(dòng)關(guān)系,用被動(dòng)語態(tài),故選B。

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