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Leaching problem

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Leaching problem

by Dean Jones » Wed Nov 30, 2011 7:20 am
Dear Friends,

I was having problems in answering the following question.

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


Please help.

OA after some discussions.

My choice was option E

Regards
Deano.
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by rijul007 » Wed Nov 30, 2011 9:56 am
IMO:D
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by rajeevrks27 » Wed Nov 30, 2011 10:01 am
IMO:D
Fire the final bullet only when you are constantly hitting the Bull's eye...till then KEEP PRACTISING...
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by shankar.ashwin » Wed Nov 30, 2011 10:03 am
Leaching <modifier> was a well-established method - Eliminate A,B and E (no need of perfect tense IMO)

In D you already mention 'method', so that would be referring it twice.

Only C is left.
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by kanwar86 » Wed Nov 30, 2011 10:07 am
IMO, option C is the correct answer
Regards

Kanwar

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by mskgmat » Wed Nov 30, 2011 10:07 am
A. as a method of the extraction of minerals, it was well established
B. as a method of the extraction of minerals well established
Leaching ....,as------- wrong (Must be followed by verb)
C. was a well-established method of mineral extraction
I think C was correct option
D. was a well-established method of extracting mineral that was
D-Wordy
E. had been a method of mineral extraction, well established
E - Wrong tense unnecessary perfect tense
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Re: Leeaching problem

by Dean Jones » Sat Dec 03, 2011 7:16 am
OA is option C. But since this was 25 years ago can't we use past prefect tense? I thought did not realize is past tense. Can somebody please explain?
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by apex231 » Sat Dec 10, 2011 5:06 am
Can someone explain why use of past perfect tense is wrong in option E in this question?

In the question below, correct option has past perfect tense -

Some historians estimate that in the Great Chicago Fire of 1871, twice as much acreage was destroyed than had earlier been ravaged in Napoleon ' s Moscow burnings of 1812 and the Great Fire of London of 1666 combined.

than had earlier been
than the amount that was earlier
over the amount that was previously
as had earlier been
as was

OA D
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