SC's Question number - 969, 970

969). 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

970). Lincoln, discovering in young manhood the secret that the Yankee peddler has learned before him, knew how to use a good story to generate good will.

(A) Lincoln, discovering in young manhood the secret that the Yankee peddler has learned before him, knew

(B) Discovering in young manhood the secret that the Yankee peddler has learned before him, Lincoln knew

(C) Lincoln, discovering the secret that the Yankee peddler had learned in young manhood before him, knew

(D) In young manhood Lincoln discovered the secret that the Yankee peddler had learned before him:

(E) Lincoln, discovered in young manhood the secret that the Yankee peddler had learned before him, knew


Answers --

969). OA - C - has correct verb-tense agreement. Correctly makes "well-established" the adjective of the proper noun "method"

A, B - incorrect - missing verb - verb is necessary here to make first half of the sentence a clause.

D - incorrect -"that was as early as" - wrongly suggests that the mineral was as early as 18 century

E - incorrect - misplaced modifier - is it the "mineral extraction" or the "method" which is "well-established"? Further wrongly suggests that leaching is no longer a method of mineral extraction

970). D is the best among all wrong choices

A, B, C - incorrect - the learning happened before the discovery so past perfect is needed.
C - incorrect - misplaced modifier - "in young manhood before him" wrongly suggests that there were other manhoods before him

E - incorrect - wrongly suggests that Lincoln was discovered.

NOTE : A present participle is best used to denote an action that is ongoing