求助 PP2 21

redhat158 · 发表于 2010-1-12 11:56:24

指代問題我想問一下D 選項為什麼不對? 正確Ｃ

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

果汁软糖 · 发表于 2010-1-12 12:44:03

其实很微妙的一个区别，就是synthetic的用法 C选项从后面的句子可以看出来，it指代的是synthetic growth hormone，指科学家合成的人造生长激素，但是被从人脑里移出的只能是天然生长激素而不是人工合成的生长激素……

redhat158 · 发表于 2010-1-12 14:51:17

豁然開朗了

求助 PP2 21

感謝

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