求解一道经典题GWD-6-Q41，对E选项有疑问。

小树鸭子 · 发表于 2013-8-3 14:17:43

The greatest road systembuilt in the Americas prior to the arrival of Christopher Columbus was theIncan highway, which, over 2,500 miles long and extending from northernEcuador through Peru to southern Chile.

A. Columbus was the Incan highway, which, over 2,500 miles long andextending

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 andextended

D. Columbus, the Incanhighway, being over 2,500 miles in length, was extended (E)

E. Columbus, the Incan highway was over 2,500 miles long, extending

排除了ABC，正确答案是E。我选的是D，即便being...这个结构用得不好（当时没想到extend的主被动问题），但是认为E选项的句子结构有点诡异，就排除了E...
请教：
E选项： The greatest road system built in the Americas prior to the arrival of Christopher Columbus, the Incan highway was over 2,500 miles long, extending....
这个句子的前面 The greatest road system ，是 the Incan highway 的同位语吗？整句相当于: The Incan highway , the greatest road system built in the Americas prior to the arrival of Christopher Columbus, was over 2,500 miles long, extending.... 吗？

总觉得E选项在the Incan highway 后面应该有个comma。。还是说加了逗号就是The greatest road system 做主语，不加逗号就是 the Incan highway 做主语，两个句子结构都没问题？

请教大家~~~万分感激

lhz910216 · 发表于 2013-8-3 15:26:04

同位语属于插入语啊~~~~在结构上前后要用“，”隔开
例如，A是主语，B是同位语
A,B,do......=B,A do....... 也就是说去掉同位语句子仍然成立
若按楼主说法 B,A,do 去掉插入语B后变成 A，do 主谓之间用“，”隔开，完全没有必要
（而且一般情况都是表述性词汇作具体名次的同位语啊，即the greatest...作Incan highway的同位语）

小树鸭子 · 发表于 2013-8-3 15:31:03

lhz910216 发表于 2013-8-3 15:26
同位语属于插入语啊~~~~在结构上前后要用“，”隔开
例如，A是主语，B是同位语
A,B,do......=B,A do....... ...

谢谢~！

supershuang · 发表于 2014-11-8 05:39:53

E如果加了逗号句子就不完整没有动词和宾语了

求解一道经典题GWD-6-Q41，对E选项有疑问。

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