本贴相关题目 GMATPrep-2008E2-SC-196 | TN-01-SC-41GMATPrep-2008E2-SC-196 |
TN-01-SC-41
TN-08-SC-31
... (XFAQ)

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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

正确答案: C

[SC悬赏令] GWD-1-Q41一道语法题？这个时态不太明白。。。

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sxs686

电梯直达

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发表于 2013-8-22 10:26:32 | 只看该作者回帖奖励

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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 (C)

E. had been a method of mineral extraction, well established

这个题我知道可以根据-ved修饰关系排除E，但是C中的这个动作难道不是发生在did not realize之前吗？？？？求解释？谢谢了