TTGWD3-19为什么不是B啊,一直怀疑whyE??

jessiebetty

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

为什么不是B啊,一直怀疑whyE??

fiftycents86

因为B里面后面是and did 结构,而句子的意思是一个伴随结构,所以后面要用ing形式

阿土莎莎