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Leaching, the recovery of copper from the drainage water of [#permalink]
 28 Jan 2005, 22:51
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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
E. had been a method of mineral extraction, well established
Explain your answer in detail pl.
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C it is
A and B miss verb to make first half a clause
D) "that was as early as" is not english 
E) misplaced modifier problem. Is it the "mineral extraction" or the "method which is "well-established"?
C) has correct verb-tense agreement and makes "well-established" adjective of proper noun "method"
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Best Regards,
Paul
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A. as a method of the extraction of minerals, it was well established
"it" is wrong
B. as a method of the extraction of minerals well established
missing a verb
C. was a well-established method of mineral extraction
sounds good
D. was a well-established method of extracting mineral that was
Sounds like the mineral was as early as 18 century
E. had been a method of mineral extraction, well established
The comma before "well" is wrong.
I would choose (C) for this one.
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Intern
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Just wanted to know that if one of the option be this
F. had been a well-established method of mineral extraction
Would it be right? I think the "had been" in option E is also wrong.... but why?
Ketan
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ketanm wrote: Just wanted to know that if one of the option be this
F. had been a well-established method of mineral extraction
Would it be right? I think the "had been" in option E is also wrong.... but why?
Ketan
i also want o add one more..... hahaha
(G) there are only 5 choice answers in GMAT and we have to choose the best from the available and it may not be the standard form of english...... 
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ketanm wrote: Just wanted to know that if one of the option be this
F. had been a well-established method of mineral extraction
Would it be right? I think the "had been" in option E is also wrong.... but why?
Ketan
Good question. Had this option been one of the choices, I would very well have chosen it. (I used correct grammar didn't I? :D)
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I think
was a well-established method of mineral extraction
sounds good
is preferrable over
had been a well-established method of mineral extraction
A simple past tense is prefered over past-perfect here, as we are not talking about two things happening, one after the other (or are we?).
Experts?
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was a well-established method of mineral extraction
Concise and correct. My vote for C.
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