天山新题20－5（链接总结里面没有）

asteller

5. 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 taken 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（C）

(E) had been a method of mineral extraction, well established

请问B选项错在什么地方呢？是不是as引导的部分要放到主语Leaching之前，或者是因为as不能引导名词性短语？as可不可以翻译为“作为”的意思呢？

LES

mm请参考下列链接：

gwd 1-41 同下 gwd 10-31
http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=59318&page=1

http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=58705&replyID=511262&skin=1

http://forum.chasedream.com/dispbbs.asp?boardid=23&star=2&replyid=537694&id=61579&skin=0&page=1

http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=78191

http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=80120

marinezheng

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

MM, 注意看句子结构，　改成Ｂ后but前不是一个句子．

asteller

原来自己晕头了，没看出来，还瞎搅和了半天呢

请问版主，我还没有做gwd的题，现在做的是大全987（Gemj）中的天山新题20，是不是这些题目在gwd里面都有呢，怎样进行两者之间同样题目的相关查找呢？请赐教！

多谢LES 版主和marinezheng！