prep07 语法2 T21 求助！

铭HAO · 发表于 2013-4-14 11:05:44

21. (25520-!-item-!-188;#058&002357)
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

这道题我在C、D之间徘徊，最终因为主动优于被动选择了D。。。但是答案是C，笔记上说D选项的it指代a synthetic growth hormone不符合逻辑，可是我看不出C和D逻辑上的任何区别啊，还望大神指点！

铭HAO · 发表于 2013-4-14 23:11:48

大神

。。。。。。。。。

dingdingtop · 发表于 2013-8-12 14:30:56

句子的逻辑意思错。意思变成了科学家在学习合成前，必须先从。。。小批量移走。it指代a synthetic growth hormone不符合逻辑，变成了任何一个、某一个synthetic growth hormone的意思。

prep07 语法2 T21 求助！

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