| Q41:
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
我选择是E，可答案为什么是C呢？
[此贴子已经被作者于2004-11-10 9:11:40编辑过] | 
