GWD 6 41

lunabird

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.

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

   Answer: E

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问题：A错在哪里？

A如果这样改对不对：

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

laihong

JJ 改的没有问题,但从意思上说,不太好.因为extending, 是由was over 2,500 miles long导致的,不应该并列.