GWD1-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 C和E选项感觉不适很清晰，帮忙分析一下，thanks!
C和E选项感觉不适很清晰，帮忙分析一下，thanks! | 
