[問題]OG156

[tapow]

156. 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.
(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
(E)to maintain dirt roads costs twice as much as for paved roads
Ans:B
我想問的是為什麼to maintain可以放在as much as裡面??
請知道的大大幫忙解答好嗎?
謝謝