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.
C\E
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
我的问题是but连接了两个独立的句子，为什么后面的it必须省略呢。it 不省略，刚好指代前面出现的company，没有问题啊，请NN指教.
谢谢ad264MM的回复。
据我所知，主句中的代词是不会指代修饰成分的，如介词短语之中的名词。
可是代词一会不能省略，一会可以省略，实在把我搞蒙了！
请问这是og10里的题么，具体是哪道题，我见过，印象不是很深刻了，谢谢！
ad264,此题的主谓省略可否用BY的理论解答？
两个句子并列,第一个句子含有be动词或者become,第二个句子中的be动词或者become必须省略,同时,一些重复的名词或形容词也必须省略。例如:
Once the economic and social usefulness of the motor was demonstrated and its superiority to the horse proved, ... (proved前省略了was)
注意:be able/unable to是be动词短语,在这个短语中be动词不是助动词,不能省略！
例:A president entering the final two years of a second term is likely to be at a sever disadvantage and is often unable to carry out a legislative program.我认为这题是company被证明不能handle the increase in the bussiness.
E选项省略了主语和系动词（is，or become？）
凡是有it的选项都不能选，因为如果主语不省略，则都不能省略。it proved不和逻辑，应该是被证明。
这样排除了ABC，D选项proving明显错误，所以只能选E
prove有主动表被动的用法，作为系动词使用
主语为人时多用主动，主语为物时，多用主动，被动也可以，但用的少。
The rumor proved true.
My advice proved to be wrong.
所以这里的the healthy care company then proved unable to 是可以的，不要在proved前加was
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