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.


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

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

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

Columbus, the Incan highway, being over 2,500 miles in length, was extended

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

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题目分析：略


选项分析：

A选项：主句为“最大的公路系统为Incan高速公路”，which引导的定语从句缺少谓语动词，错误。

B选项：extended和was并列，主语均为system，但不能是“系统”从北到南延伸，而是“高速公路”延伸。

C选项：the road system是the Incan highway的同位语，之后是which引导的定语从句，此时主句没有谓语动词，错误。

D选项：主句的谓语动词是“was extended” —— 被动语态，但逻辑上应该是高速公路主动从北到南延伸，而不是被动延伸。

E选项：正确。extending为现在分词表主动，是主句的伴随状语。

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Prep2008E2-SC