请教两道 GWD SC

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

   Answer: （e）

Q30:

Under high pressure and intense heat, graphite, the most stable form of pure carbon, changes into the substance commonly referred to as diamond and remaining this way whether or not the heat and pressure are removed.

1. remaining this way whether or not

2. remaining like that even as

3. remaining as such whether or not

4. remains in this way although

5. remains thus even when

   Answer: （d）

Q19:

After several years of rapid growth, the healthy care company became one of the largest health care providers in the metropolitan area, but then （the company) proved unable to handle the increase in business, falling months behind in paying doctors and hospitals.

可能C/E不好判断。

不过C中的it也许会有歧异？因为前面还有metropolitan area，如果省去大家也知道是company.

Q30:

Under high pressure and intense heat, graphite, the most stable form of pure carbon, changes into the substance commonly referred to as diamond and remaining this way whether or not the heat and pressure are removed.

1. remaining this way whether or not
2. remaining like that even as
3. remaining as such whether or not
4. remains in this way although
5. remains thus even when

graphite changes into the substance and remaines in this way. 立刻看D/E，E根本不通。

选D。