GWD-18-Q1

The Arthritis Research Institute of America advises women of color that they have twice the likelihood to get osteoarthritis of the knee as do White women.  (B选项在advise后不是应该用be吗？为何可以直接用Are呢？）

B.      that they are twice as likely as White women to get osteoarthritis of the knee

Whereas lines of competition are clearly defined in the more established industries, in the Internet industry they are blurred and indistinct, as companies that compete one day may be partners the next. （B为正确选项，但为何不能选A?）

A.      Whereas lines of competition are clearly defined in the more established industries, in the Internet industry they are blurred and indistinct, as companies that compete

B.      Although the lines of competition are clearly defined in industries that are more established, they are blurred and indistinct in the Internet industry, as competing companies

Over the course of the eighteenth century, the average output of ironwork tripled as a result of several improvements in blowing machinery and because coal replaced charcoal as the fuel used in the smelting of iron ore.  （A为正确选项，但为何不能选C?）

A.      Over the course of the eighteenth century, the average output of ironwork tripled as a result of several improvements in blowing machinery and because coal replaced charcoal as the fuel used in the smelting of iron ore.

C.      With charcoal’s being replaced by coal as the fuel used in the smelting of iron ore and several improvements in blowing machinery, the average output of ironwork tripled over the eighteenth century.

GWD17-Q29:

Mary Wollstonecraft’s A Vindication of the Rights of Woman (1792) was unprecedented in its firsthand accounts of the indignities suffered by women and because it was eloquent and passionate in exposing and criticizing these indignities. （D为正确选项，但为何不能选C?）

D.      and in the eloquence and passion with which it exposed and criticized

谢谢楼上指教，还有一个地方不是很清楚，第一题中，向您所说，advise后面的从句应用虚拟语气，所以Be动词应用原型，可正确答案中为何可以直接用are呢？