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Because she knew many of the leaders of colonial America and the American Revolution personally, Mercy Otis Warren was continually at or near the center of political events from 1765 to 1789, a vantage point combining with her talent for writing to make her one of the most valuable historians of the ear
(a) a vantage point combining with her talent for writing to make
(b) a vantage point, when combined with her talent for writing, that made
(c) a vantage point that combined with her talent for writing, and it made
(d) and this vantage point, which combined with her talent for writing to make
(e) and this vantage point, combined with her talent for writing, made
答案选E,B为什么错误?
Before scientists learned how to make a synthetic growth hormone, removing it painstakingly in small amounts from the pituitary glands of human cadavers.
(a) scientists learned how to make a synthetic growth hormone, removing it painstakingly
(b) scientists had learned about making a synthetic growth hormone, they had to remove it painstakingly
(c) scientists learned how to synthesize the growth hormone, it had to be painstakingly removed
(d) learning how to make a synthetic growth hormone, scientists had to remove it painstakingly
(e) learning how to synthesize the growth hormone, it had to be painstakingly removed by scientists
答案选C,D为什么不可以?
[此贴子已经被作者于2006-2-8 20:51:22编辑过] |