mehrak Posted November 7, 2008 Share Posted November 7, 2008 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 OA:C why not E? because “Leaching” is happened earlier than the second part of the statement. Can anybody explain plz? Quote Link to comment Share on other sites More sharing options...
effective_factor Posted November 8, 2008 Share Posted November 8, 2008 past perfect is not required here C it is Quote Link to comment Share on other sites More sharing options...
adi_800 Posted November 8, 2008 Share Posted November 8, 2008 eliminate a n b for using as-> as cant introduce phrase well established shud come b4 method so tht reader can come to know that what exactly is well established.. d-> relative clause introduced by that is nt required... e-> pst perfect nt required.... Quote Link to comment Share on other sites More sharing options...
bearbull Posted November 8, 2008 Share Posted November 8, 2008 E could mean mineral extraction is well established and not leaching in particular . Quote Link to comment Share on other sites More sharing options...
Rising_Sun Posted November 8, 2008 Share Posted November 8, 2008 C is fine. Past perfect is not required. E is also ambiguous becuase it is not clear 'well established' modifies to 'method' or 'mineral extraction'. In C it is clear. Quote Link to comment Share on other sites More sharing options...
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