GWD 23-23 关于while 和 but的区别及省略问题

coffeenow

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

OA:E

这道题目研究和很久还是有些疑惑.很多讨论直接排除了A/B/C/D选项,因为A/B/C/D中均没将prove 的被动含义表达出来.
同时认为E中省略的BE动词,所以仅有E是正确的.
根据but的平行及省略原则,是否看出这里是省略了became, 而proved在but句中是过去分词做表语?????
有点晕,烦求哪位NN出来解释下? 谢谢了

moonlolita

prove不是主动表被动吗？这题帮忙顶，还是没搞懂省略问题

辣椒巧克力

it指代的是company 那么与prove是被动关系 故A B C 逻辑搭配错误 D 的主动被动关系也错误

coffeenow

可是我还是不恩能够理解E的被动是哪里来的?省略了什么呢?