请教：OG12 89

saraza

89.

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 maintaing 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

答案是B

我知道比较的对象是dirt roads和paved roads ，但是我不理解B中的to maintain是什么成分？我选的是C，是不是如果最后没有do，C就是正确的？

AlienX

C中的it沒指代

snail007

B.dirt roads cost twice as much to maintain as paved roads do

B is correct. Dirt roads ~ paved roads

to maintain 是不定式修饰verb. cost

C.maintaining dirt roads costs twice as much as paved roads do

C is wrong because it compares maintaining to paved roads

如果改成，
maintaining dirt roads costs twice as much as maintaining paved roads does

就对了。

个人意见，请大牛指点

fehler

按照题目里面C的写法，是把maintaining和paved roads比，不正确。没有does还是不正确。

B.dirt roads cost twice as much to maintain as paved roads do

B is correct. Dirt roads ~ paved roads

to maintain 是不定式修饰verb. cost

C.maintaining dirt roads costs twice as much as paved roads do

C is wrong because it compares maintaining to paved roads

如果改成，
maintaining dirt roads costs twice as much as maintaining paved roads does

就对了。

个人意见，请大牛指点

-- by 会员 snail007 (2009/12/14 8:19:27)

saraza

恩~明白了哈~~谢谢哦~

saraza

B.dirt roads cost twice as much to maintain as paved roads do

B is correct. Dirt roads ~ paved roads

to maintain 是不定式修饰verb. cost

C.maintaining dirt roads costs twice as much as paved roads do

C is wrong because it compares maintaining to paved roads

如果改成，
maintaining dirt roads costs twice as much as maintaining paved roads does

就对了。

个人意见，请大牛指点

-- by 会员 snail007 (2009/12/14 8:19:27)

c中 dirt raods 和 paved roads是做maintaining的宾语吧，宾语的比较的话应该可以asmuch as后直接加paved roads的吧。我看到某大牛是这么写的http://forum.chasedream.com/GMAT_SC/thread-103101-1-1.html

是不是？

snail007

maintaining dirt roads costs twice as much as paved roads do

dirt roads 是maintaining 的宾语，但是paved roads 变成主语啦，后面有verb. "do"  

显然不对

B.dirt roads cost twice as much to maintain as paved roads do

B is correct. Dirt roads ~ paved roads

to maintain 是不定式修饰verb. cost

C.maintaining dirt roads costs twice as much as paved roads do

C is wrong because it compares maintaining to paved roads

如果改成，
maintaining dirt roads costs twice as much as maintaining paved roads does

就对了。

个人意见，请大牛指点

-- by 会员 snail007 (2009/12/14 8:19:27)

c中 dirt raods 和 paved roads是做maintaining的宾语吧，宾语的比较的话应该可以asmuch as后直接加paved roads的吧。我看到某大牛是这么写的http://forum.chasedream.com/GMAT_SC/thread-103101-1-1.html

是不是？

-- by 会员 saraza (2009/12/14 13:44:40)

lpdeng

D选项里的it难道不能指代 maintaining  么？

mycontrol01

哈哈 这个似乎我可以回答LS

it指代必须全部指哦 指maintaining的话就必须指上maintaining dirt roads 全体~


that和it区别  

个人意见!

imagelan

mycontrol01同学正确it只能特指前面名词的整体，包括名词的修饰性成分。