[求助]TTGWD-3-Q39 （在讨论贴里实在是找不到！）

ttgwd-3-Q39同5-Q39

Q39:

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.

1. Columbus was the Incan highway, which, over 2,500 miles long and extending
2. Columbus was the Incan highway, over 2,500 miles in length, and extended
3. Columbus, the Incan highway, which was over 2,500 miles in length and extended
4. Columbus, the Incan highway, being over 2,500 miles in length, was extended
5. Columbus, the Incan highway was over 2,500 miles long, extending

   Answer:  
                    E      Mine:B

我是这么想的：

E项主要结构是：The system..., the Incan highway was..., extending...(修饰incan highway)

B项： The system...was the Incan highway, over...（修饰highway)，and extended...（与was并列）好象也可以~~

这么一来，似乎两个答案都对了。

问题出在哪儿呢？请指正！

为啥没人理？

自己顶一下~

over是一个介词短语，要说做插入语吧（？），似乎也不那么好，毕竟它表达的意思是句子的主要意思

而extended就没有与之并列的成份了，是不能和was并列的,be动词和实意动词并列？偶语法基础不好，觉得不对

这道题我的思路是这样的，注意看我用黄色标注的几个单词

Q39:

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.

1. Columbus was the Incan highway, which, over 2,500 miles long and extending
2. Columbus was the Incan highway, over 2,500 miles in length, and extended
3. Columbus, the Incan highway, which was over 2,500 miles in length and extended
4. Columbus, the Incan highway, being over 2,500 miles in length, was extended
5. Columbus, the Incan highway was over 2,500 miles long, extending

Answer:

第一步通过and并列结构前后两部分必须尽量一致的原则，我们可以排除A。之后B动词圆形单独在逗号之后应该前面有连词，这里也没有，排除B。C的问题在于使句子没有谓语动词，D的问题在于being的用法，还有我觉得一个重要的问题就是它改变了句子动词的重心！E最符合语法要求，ing形式在句末表示伴随结果或方式

我觉得楼上B的解释有点含糊。

E的话，前面句首那一长串东西不是成了垂悬结构了吗？

B的话，除了in length有点wordy,也不觉得有错阿

谁有比较清楚易懂的解释呢？

谢谢