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# Leaching, the recovery of copper from the drainage water of

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VP
Joined: 17 Jun 2008
Posts: 1374

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Leaching, the recovery of copper from the drainage water of [#permalink]

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30 Aug 2008, 08:43
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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

This is quite confusing
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Director
Joined: 10 Sep 2007
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30 Aug 2008, 09:21
A. as a method of the extraction of minerals, it was well established
"Leaching" and "It" two subjects in same sentence.

B. as a method of the extraction of minerals well established
Missing "verb".

C. was a well-established method of mineral extraction
Seems correct.

D. was a well-established method of extracting mineral that was
"was" used twice. Change in meaning also.

E. had been a method of mineral extraction, well established
Past perfect tense not needed.

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Current Student
Joined: 11 May 2008
Posts: 555

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30 Aug 2008, 09:37
abhijit_sen wrote:
A. as a method of the extraction of minerals, it was well established
"Leaching" and "It" two subjects in same sentence.

B. as a method of the extraction of minerals well established
Missing "verb".

C. was a well-established method of mineral extraction
Seems correct.

D. was a well-established method of extracting mineral that was
"was" used twice. Change in meaning also.

E. had been a method of mineral extraction, well established
Past perfect tense not needed.

here well established is what??? mineral extraction was well established or method was ??
also, had been ... hmmmm i think simple past in C i.e 'was' is ok
but in C, not sure of the phrase 'well-established method of mineral extraction'... but bet'n the two i'd opt for C.

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VP
Joined: 17 Jun 2008
Posts: 1374

Kudos [?]: 406 [0], given: 0

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30 Aug 2008, 10:26
abhijit_sen wrote:
A. as a method of the extraction of minerals, it was well established
"Leaching" and "It" two subjects in same sentence.

B. as a method of the extraction of minerals well established
Missing "verb".

C. was a well-established method of mineral extraction
Seems correct.

D. was a well-established method of extracting mineral that was
"was" used twice. Change in meaning also.

E. had been a method of mineral extraction, well established
Past perfect tense not needed.

as early as eighteenth century in the sentence confused me
so i thought well established as early as eighteenth century .I can u elaborate this point a bit.

OA C
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VP
Joined: 05 Jul 2008
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30 Aug 2008, 10:32
If you take out the dependent clause in between ( the recovery of copper from the drainage water of mines) and read the sentence only C & D makes sense to start with.

Between C & D it is clearly C

D is awkward and uses modifier "that" which is not needed.

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Re: SC3   [#permalink] 30 Aug 2008, 10:32
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