Before scientists learned how to make a synthetic growth hormone, removing it painstakingly in small amounts from the pituitary glands of human cadavers.
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
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
我觉得明明是D更好, 还是主动
这道题的主要问题不在主动被动上,而在意思的表达上。首先一点要明白原句为什么用被动形式,原句意在表达removing it painstakingly,而前面部分是状语,如果选择D的话,那么scientists就变成了主语,这个跟原句的表达不符。另外,被动表达不一定都不如主动表达,尤其在动作发出者不明确的时候,优选被动表达,这道题就是很典型的被动优于主动。从原句中,你无法判断removing it的人是谁,不是说scientists研究了一个东西,就一定是scientists去remove,两个动作的发出者可能是不一致的。不知道这样解释LZ清楚了没有。不要只专注在一些定理上,这些对于现在的GMAT考试已经过时了,还是要看句子的表达。希望LZ取得好成绩!
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