prep 语法3

racy0226

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

lisaireland

为什么不选D呢？

racy0226

我明白了，名词不如动词好啊

lisaireland

这道题，我一读到D，就选它了。因为它真的很清晰很简洁呀~没有太多冗杂的词汇~

racy0226

我一开始也选的D,但我刚才又看看，发现了D中的是个名词，所以不好

xlc1989728

这道题it是完全指代，D中指代的是synthetic growth hormone，不合逻辑