[求助] 新prep 186

186.      (32899-!-item-!-188;#058&007188)         (GWD-6-Q41)

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

我觉得只能在B,E中选，其他都有明显错误，总觉得over...length放中间很别扭，选E吧。。。

期待各位的意见

我觉得也是选E。

The greatest road system...是同位语，the Incan highway was over 2,500 miles long是主句。后面加一个伴随状语。很完整的结构。

B的话，中间插入的部分不知道做什么成分。

選E, B錯是因為句意不通

B.
Columbus was the Incan highway, over 2,500 miles in length, and extended

    extend(v) 對應到的S是 The
greatest road system,中間插入句不看就變成:

   The
greatest road system
            extended rom northern Ecuador through Peru
to southern Chile

    這樣會變成系統縱貫from northern to southern 句意就不通啦