GWD17 第二题 我记得PREP上说and 前有逗号和没逗号是有区别的 为什么不选C呢

zowenny

After several years of rapid growth, the healthy care company became one of the largest health care providers in the metropolitan area, while it then proved unable to handle the increase in business, falling months behind in its payment to doctors and hospitals.

A.    while it then proved unable to handle the increase in business, falling months behind in its payment to
B.    while it then proved unable to handle the increase in business and fell months behind in its payment to
C.    but then it proved unable to handle the increase in business, falling months behind in its paying
D.    but then proving unable to handle the increase in business, falling months behind in paying
E.    but then proved unable to handle the increase in business, falling months behind in paying

答案选D

aeoluseros

应该选E。prep2-223