GWD-TN-4 41

always007

GWD4-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
正确答案：e     求翻译。  system=highway?