用的TTGWD,讨论贴太少了,今天先发帖问一下,明天换XYGWD来做

Q31 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.

1. as a method of the extraction of minerals, it was well established /// it 多余
2. as a method of the extraction of minerals well established
3. was a well-established method of mineral extraction
4. was a well-established method of extracting mineral that was /// that was结构同后面的as结构修饰mineral,改变句意
5. had been a method of mineral extraction, well established ///had been的时态错

Answer: B

我当时的想法是as....as结构的第一个as是副词,所以应该修饰动词,所以就在BC之间选了B, leaching<as a method of the extraction of minerals> well established as early as....; 而C的as 结构跟在extraction后面,副词不能修饰名词的啊!!!

请CDer,N或非N帮帮忙!!

顶一个;

发现B里面的well established可能修饰前面的minerals,但是上面的疑问还是没有消除