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73Leaching

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by real2008 » Fri Jul 03, 2009 3:15 am
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 taken 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


Why not E?
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Re: 73Leaching

by mittalashwani13 » Fri Jul 03, 2009 6:16 am
real2008 wrote: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 taken 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


Why not E?
Because sentence needs a simple past tense instead of the past perfect ...
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Re: 73Leaching

by kanha81 » Sat Jul 04, 2009 8:50 pm
real2008 wrote: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 taken 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


Why not E?
Real2008,
You're posting good questions, but you're not underlining the part of question that requires our introspection. Kindly, please for the sake of fellow GMATTERs' underline the question stem.

Best regards,
Kanha81
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by dumb.doofus » Sat Jul 04, 2009 9:20 pm
IMO C

a] Unnecessary use of "it". Awkward structure.

b] Again quite awkward structure.. also needs to use simple past - "was established"

c] Perfect

d] Redundant "that was"

e] Unnecessary past perfect.
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Re: 73Leaching

by real2008 » Sat Jul 04, 2009 11:23 pm
kanha81 wrote:
real2008 wrote: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 taken 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


Why not E?
Real2008,
You're posting good questions, but you're not underlining the part of question that requires our introspection. Kindly, please for the sake of fellow GMATTERs' underline the question stem.

Best regards,
Kanha81
I will do next time...sorry for inconvenience...
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by tohellandback » Sun Jul 05, 2009 3:46 am
IMO C.
Concise
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by real2008 » Sun Jul 05, 2009 7:31 am
oa is C.
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by goelmohit2002 » Mon Jul 06, 2009 5:10 am
dumb.doofus wrote:IMO C
a] Unnecessary use of "it". Awkward structure.
Can someone please tell why "it" is redundant in A ?
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Re: 73Leaching

by BlindVision » Tue Jul 07, 2009 2:14 am
real2008 wrote: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 taken 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


Why not E?
it should be omitted because it is incorrectly referring to minerals.

Helpful ways to read it:

Leaching...it was well established as early as the eighteenth century...

OR

Leaching...was well established as early as the eighteenth century...

Hope that Helps!
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