新prep-1-223

After several years of rapid growth, the health 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

我没有觉得有it错，而是觉得应该需要it因为逗号+conjunction 是连独立句子的所以觉得D和E这两点不对。

你说的规则适用于并列性连接词比如and，而but是转折性连接词，习惯性前面有comma，即便后面是fragment.

alien兄，可是语法书上说介词后面是"动名词"诶，不过我前面犯了一个错误，one's doing sth.里面doing sth.应该也是动名词.由此我倒想到了一点:当前面的主语也是其后面介词短语中动名词的行为者，那么介词短语中是不用加上主语的.也即paying是the health company这个行使的，所以paying前面不需要加its.这个题目应该不能用fall behind (someone/something)(fall behind schedule/the others：落后于……)这个短语关系来判断，因为in paying不能充当那个someone/something，毕竟前面有个介词in。

hmm~~~很深刻。

动名词之前加物主代词是为了表明逻辑关系，也就是当动名词的动作发出者与主语不相同时，可以用这种方法来明确。即使是在一个介宾的结构中。

eg: He strongly objected to your saying that.

也就是说in its paying的its是可以省略的。但是这个应该是effectiveness的错误吧。

我觉得这题还有个问题，the health care company应该是被证明blahblahblah，所以 prove应该是个被动态。而只有E能看成是主语与be动词的同时省略。不知道这样理解对不对。偶当时就考这个，秒杀出E的。。。