答案是A.一旦被建造.C的话表明一旦正在被建造.不符合逻辑.
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高中英语Some people against toll booths argue that roads,once ___,should be free.
高中英语Some people against toll booths argue that roads,once ___,should be free.
A.built B.having built C.being built选哪个正确?为什么?
A.built B.having built C.being built选哪个正确?为什么?
英语人气：323 ℃时间：2019-10-05 12:22:55
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