例5：
According to a recent poll,owning and living in a freestanding house on its own land is still a goal of a majority of young adults,like that of earlier generations.
· A like that of earlier generations 分析A选项
· B as that for earlier generations 分析B选项
· C just as earlier generations did 分析C选项
· D as have earlier generations 分析D选项
· E as it was of earlier generations
分析：According to a recent poll介词短语在句首作状语，句子主语owning and living in a freestanding house on its own land谓语 is ，宾语a goal of a majority of young adults，
Like作比较的用法是like A,B这个B是句子的主语。
(A)that of+名词，那么that指的是前面已经出现的名词，也就是a goal ，而a goal是宾语，不是主语，所以排除。
(B)As是连词，如果比较的对象是主语，最好把助动词加上，而且that指代不清楚。排除。
(C)句子的谓语是is，所以助动词did补充不恰当。
(D)助动词补充错误，即便是表示完成时态也应该是have been。
(E)句子的第二部分应该与第一部分平行，所以只有E选项中的it对应第一部分的主语owning and living in a ....，was对应第一部分的谓语is。
正确句子：
According to a recent poll,owning and living in a freestanding house on its own land is still a goal of a majority of young adults,as it was of earlier generations。
例6：
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.
窗体顶端
· A dirt roads cost twice as much as maintaining paved roads 分析A选项
· B dirt roads cost twice as much to maintain as paved roads do 分析B选项
· C maintaining dirt roads costs twice as much as paved roads do 分析C选项
· D maintaining dirt roads costs twice as much as it does for paved roads 分析D选项
· E to maintain dirt roads costs twice as much as for paved roads
分析：
Dirt roads句子主语，evoke 谓语动词，bucolic simplicity of another century名词短语做宾语，but 连接一个完整句子，句子主语是financially strained townships，谓语是 point out ，后面是 that 引导的宾语从句，所以划线部分考察的就是as……as,dirt roads和maintaining paved roads是比较对象，
(A)比较形式不对称，前边是名词短语，后边是doing结构。排除
(B)比较对象是句子的主语，也就是宾语从句的主语，所以补充助动词do,因为宾语从句中谓语动词是cost一个实义动词，所以补充do是没问题的。to maintain 是个介词短语，正确
(C)前边是doing结构后边是名词结构，不平行，排除
(D)比较形式不对称，排除
(E)比较形式不对称，前边是to do ，后边是名词。排除
正确句子：
Dirt roads may evoke the bucolic simplicity of another century, but financially strained townships point out that dirt roads cost twice as much to maintain as paved roads do .
句子的比较结构其实是x costs twice as much to maintain as Y.
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