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[Sentence Correction]
试题详情
题目：
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.
选项:
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:
E
提问：
我选的是C，是因为it的指代有问题吗？还有，but和while的区别在哪里？
解答：
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