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.
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.
Aas a method of the extraction of minerals, it was well established
Bas a method of the extraction of minerals well established
Cwas a well-established method of mineral extraction
Dwas a well-established method of extracting mineral that was
Ehad been a method of mineral extraction, well established
答案是C没有异议,但是Ron在解释E项的错误时,对于had been的解释也没啥问题,但是他还指出e项一个错误,说well establish在此处的非限定修饰不对,看了他对于non essential和essential的解释后,我觉得在此题不适用啊。 尽管e中well established确实是做非限定修饰,但是用来修饰leaching也没有错嘛,因为leaching本来就是 the method of mineral extraction 。
我觉得此处well established的问题在于, 本来之后的as early as the eighteenth century是修饰method的,在e项中却变成了established这个状态的时间修饰
好像表达的不是很清楚
http://www.manhattangmat.com/forums/leaching-the-recovery-of-copper-t11771.html
ron解答的原帖
求大神解答
跪谢