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.
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