[SC. ] GWD8-31
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.
as a method of the extraction of minerals, it was well established
as a method of the extraction of minerals well established
was a well-established method of mineral extraction
was a well-established method of extracting mineral that was
had been a method of mineral extraction, well established
(C)
想問(E)選項的錯誤在哪[我的認知:had been 時態好像沒錯(realize之前)
established修飾O a method.]
感謝。
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