Solutions
Get detailed explanations to advanced GMAT questions.
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.
Option A:
as a method of the extraction of minerals, it was well-established
Option B:
as a method of the extraction of minerals well established
Option C:
was a well-established method of mineral extraction
Option D:
was a well-established method of extracting mineral that was
Option E:
had been a method of mineral extraction, well established
Difficulty Level
EasySolution
Option C is the correct answer.
Option Analysis
Concept tested: Sentence fragment, modifiers, tenses.
A) This is a sentence fragment. Moreover, it uses the pronoun “it” which is ambiguous.
B) Sentence fragment.
C) Correct Answer
D) Inappropriate usage of “That” as it refers to minerals.
E) Wrong tense. We do not require past perfect tense.
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