请教GWD31-4-19

Q19:

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.

1. while it then proved unable to handle the increase in business, falling months behind in its payment to

2. while it then proved unable to handle the increase in business and fell months behind in its payment to

3. but then it proved unable to handle the increase in business, falling months behind in its paying

4. but then proving unable to handle the increase in business, falling months behind in paying

5. but then proved unable to handle the increase in business, falling months behind in paying

答案是E,请大家看看,我机子打不开longman了

这道题选E么，昨天有人问过的我选的是A，因为我记得prove这个词是主动表被动的用法，而E里面等于省略了it is, 即原来是but then (it is )proved unable to...   而prove的正确用法是It proved unable to....

所以我想问有没有权威说法证实这种主动表被动的词可以象E这样用么？

多谢

首先，划线部分是分句，它是与became并列，所以应省掉它的主语it,否则重复，falling是proved的状语，也就是falling现在分词短语做状语表示状态，e正确 。

I would choose D.

Besides, in paying is the correct way of expressing.