[問題]天山3-Q20

[josephcfan]

Leaching, the recovery of copper from the drainage water of mines, as a method of the extraction of minerals, it was well established as early as the eighteenth century, but until about 25 years ago miners did not realize that bacteria take an active part in the process.


A. as a method of the extraction of minerals, it was well established
B. as a method of the extraction of minerals well established
C. was a well-established method of mineral extraction
D. was a well-established method of extracting mineral that was
E. had been a method of mineral extraction, well established

可否解释一下为何 C 对啊,句型实在是看不太出来,而A又是哪里出了问题呢

[soami]

Leaching, the recovery of copper from the drainage water of mines, as a method of the extraction of minerals, it was well established as early as the eighteenth century, but until about 25 years ago miners did not realize that bacteria take an active part in the process.


A. as a method of the extraction of minerals, it was well established
B. as a method of the extraction of minerals well established
C. was a well-established method of mineral extraction
D. was a well-established method of extracting mineral that was
E. had been a method of mineral extraction, well established

可否解释一下为何 C 对啊,句型实在是看不太出来,而A又是哪里出了问题呢

這題gwd裡面有，以前有討論過

我來回應一下 , the recovery of copper from the drainage water of mines,這句話是 Leaching 的同位格，同位格後面通常接的是動詞，所以請先找動詞。

A的話同位格後之後又出現一個同位格，as a method of the extraction of minerals，但是as可以去掉。
然後後面 it was well established 這個it跟主詞重複可以刪掉。

C的話，有名詞就用名詞，不要改成動名詞的字。