Another two months will be needed before the new bridge -------------. A completesB is completed C 选哪一项,为什么?

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Another two months will be needed before the new bridge -------------. A completesB is completed C 选哪一项,为什么?
Another two months will be needed before the new bridge -------------. A completesB is completed C
选哪一项,为什么?

Another two months will be needed before the new bridge -------------. A completesB is completed C 选哪一项,为什么?
Another two months will be needed before the new bridge (is completed.
还要两个新桥才能竣工.
后面要用is completed而不能用completes,因为桥自己是不会建的,因此要用被动的形式

还需要两个月这座新桥才能竣工