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

Solution:

Subject verb agreement + Modifier

A and B: a verb is missing in the first half of the sentence to make it a clause and hence, is incorrect. “Leaching,…, as a…, it was..”
D: “that” refers should refer to “method” but here it seems to be referring to “mineral” which is incorrect. "that was as early as" - wrongly suggests that the “mineral” was as early as 18 century.
E: misplaced modifier - is it the "mineral extraction" or the "method" which is "well-established"? Further “ had been” wrongly suggests that leaching is no longer a method of mineral extraction
C: Best choice.


Sentence Correction - 1000 Questions with Solution:
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with solution SC- 898/1000 with solution SC- 899/1000 with solution SC- 900/1000 with solution SC- 901/1000 with solution SC- 902/1000 with solutionSC- 903/1000 with solution SC- 904/1000 with solution SC- 905/1000 with solution SC- 906/1000 with solution SC- 907/1000 with solution SC- 908/1000 with solutionSC- 909/1000 with solution SC- 910/1000 with solution SC- 911/1000 with solution SC- 912/1000 with solution SC- 913/1000 with solution SC- 914/1000 with solutionSC- 915/1000 with solution SC- 916/1000 with solution SC- 917/1000 with solution SC- 918/1000 with solution SC- 919/1000 with solution SC- 920/1000 with solutionSC- 921/1000 with solution SC- 922/1000 with solution SC- 923/1000 with solution SC- 924/1000 with solution SC- 925/1000 with solution SC- 926/1000 with solutionSC- 927/1000 with solution SC- 928/1000 with solution SC- 929/1000 with solution SC- 930/1000 with solution SC- 931/1000 with solution SC- 932/1000 with solutionSC- 933/1000 with solution SC- 934/1000 with 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