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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73Leaching
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mittalashwani13
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Because sentence needs a simple past tense instead of the past perfect ...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?
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kanha81
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Real2008,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?
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.
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Kanha81
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dumb.doofus
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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.
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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I will do next time...sorry for inconvenience...kanha81 wrote:Real2008,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?
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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tohellandback
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goelmohit2002
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Can someone please tell why "it" is redundant in A ?dumb.doofus wrote:IMO C
a] Unnecessary use of "it". Awkward structure.
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BlindVision
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it should be omitted because it is incorrectly referring to minerals.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?
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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