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?

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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?
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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?
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?

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?
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.
科霖团队为您解惑.

C...现在分词被动式,作定语,修饰roads

C Being built

C,被动语态