OG156
Dirt roads may evoke the bucolic simplicity of another century, but financially strained townships point out that dirt roads cost twice as much as maintaining paved roads.
(A) dirt roads cost twice as much as maintaining paved roads
(B) dirt roads cost twice as much to maintain as paved roads do
(C) maintaining dirt roads costs twice as much as paved roads do
(D) maintaining dirt roads costs twice as much as it does for paved roads（B）
(E) to maintain dirt roads costs twice as much as for paved roads
我个人认为是D对,为什么答案是B?
楼上的兄台，如果D是对的，那么请问' it does for paved roads'中的it指代什么呢？
你可能认为it指代maintaining，那么maintaining 在这里到底算动词，还是名词呢？如果是名词，显然maintain有自己的名词maintenance。
仅供参考！
这个说法太牵强了.
为什么B说得通呢?请你从语法的角度解释一下.另外MAINTENANCE OF SOMETHING,
这里MAINTAINING SOMETHING是动名词哩.
B没有问题：1.cost money to do sth; 2.do指代'cost money to do sth'
E中it只能指代名词(动词没有专属的名词除外)。
仅供参考！
ya, you are right. Thanks so much.
同意tasteofbit的说法~
D的it指代不清。
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