请教语法题

mslancaster

请教各位大侠：
The greatest road system built in the Americas prior to the arrival of Christopher Columbus was the Incan highway, which, over 2,500 miles long and extending from northern Ecuador through Peru
to southern Chile.
A.Columbus
was the Incan highway, which, over 2,500 miles long and extending
B.Columbus
was the Incan highway, over 2,500 miles in length, and extended
C.Columbus
, the Incan highway, which was over 2,500 miles in length and extended
D.Columbus
, the Incan highway, being over 2,500 miles in length, was extended(E)
E.Columbus
, the Incan highway was over 2,500 miles long, extending
正确答案是E，请问，E选项中“the Incan highway"作为主语的话，”The greatest road system“又该是什么成分呢？是不是有两个主语的嫌疑呢？
谢谢！

luciferc

just a modifier,provide extra information about the subject

mslancaster

谢谢！
不过还是比较难以接受，毕竟两个主语有非常明显的嫌疑。
相比之下，倒是觉得B选项是相对正确的。
再次感谢！

阿趁心观

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夏政峰  billionaire lucky-guy guilty-crown  http://wikipps.hk

luciferc

谢谢！
不过还是比较难以接受，毕竟两个主语有非常明显的嫌疑。
相比之下，倒是觉得B选项是相对正确的。
...
mslancaster 发表于 2012-10-14 21:26

B is fatally wrong(in this choice A system is the subject)


A system cannot extend


only the highway can

EvaCheng

let us split the five opinion:

(1) A/B   "Was the Incan highway"  
用主谓结构表达， 从meaning有问题，the greatest road system  was the Incan highway ....   
我们日常说  the in can highway was the greatest road system.... 对吗？
(3)C/D/E  "the Incan highway,"
用了同位语（noun modifer）表达， 同位语补充说明 主语"the Incna highway“
The greatest road system built in the Americas prior to the arrival of Christopher  Columbus , the Incan highway was ....

LZ 可以这么去记，如果作者一个NOUN1, NOUN2 说的是一个东西，但是从不同方面去说， 很大机会用在用同位语表达，　毕竟 ”to be “比较soft．我们可以eliminate it.  即("noun1 , noun2"   better than ” noun1 is/was noun2").

mslancaster

这样解释我能接受了，非常感谢！