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 错，没有主语
(B) scientists had learned about making a synthetic growth hormone, they had to remove it painstakingly 错about making a synthetic 太冗长了
(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 相对原文改动最小
(E) learning how to synthesize the growth hormone, it had to be painstakingly removed by scientists 错learning的逻辑主语是it ，不对
本题答案是C ，我选择了D，答案边上是我认为了一些解释，不过C 和 D一时也想不出如何选择，还望请教啊 | 
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发表于 2010-4-11 16:23:26
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