读完看选项DE差太远了排除了。剩下ABC，B是强调了那个人语义不对排除。剩下AC觉得A用in强调在planning to practice in socioeconomically deprived areas这方面有4倍可能（在哪方面比谁更有4倍可能觉得语义通顺）所以选A了。请老师解答 还有一题也是模考系统里面的 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 BE应该怎么比。