Live GMAT classes with Target Test Prep start Nov 21 and Nov 22. First class free.

See classes
Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

Newsweek Readers’ Choice Awards 2026 winner: Target Test Prep, #1 Test Prep

Target Test Prep was voted #1 Best Test Prep in the 2026 Newsweek Readers’ Choice™ Awards.

★★★★★5.0563 reviews
GMATLiveTeachStarts Nov 1
Josh Braslow, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Josh Braslow, 20+ years in test prep

Nov 1 · Josh Braslow
Sun · 1:00 to 4:00 PM ET
Nov 22 · Josh Braslow
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemand5 seats leftStart anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemandStart anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 563 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

Leaching problem

Expert replies
Post new topic Locked
Subscribe topic
Previous Topic Next Topic
Master | Next Rank: 500 Posts
Posts: 239
Joined: Thu Oct 28, 2010 8:40 amFollowed by: 2 members
Location: India
Thanked: 5 times
GMAT Score:690
by Dean Jones » Wed Nov 30, 2011 7:20 am
Dear Friends,

I was having problems in answering the following 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.

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


Please help.

OA after some discussions.

My choice was option E

Regards
Deano.
Top
Join the discussion
Source: — Sentence Correction |
User avatar
Legendary Member
Posts: 588
Joined: Sun Oct 16, 2011 9:42 amFollowed by: 9 members
Location: New Delhi, India
Thanked: 130 times
GMAT Score:720

by rijul007 » Wed Nov 30, 2011 9:56 am
IMO:D
Top
Join the discussion
Junior | Next Rank: 30 Posts
Posts: 19
Joined: Wed Nov 10, 2010 5:05 am
Location: India

by rajeevrks27 » Wed Nov 30, 2011 10:01 am
IMO:D
Fire the final bullet only when you are constantly hitting the Bull's eye...till then KEEP PRACTISING...
Top
Join the discussion
Legendary Member
Posts: 966
Joined: Sat Jan 02, 2010 8:06 amFollowed by: 21 members
Thanked: 230 times

by shankar.ashwin » Wed Nov 30, 2011 10:03 am
Leaching <modifier> was a well-established method - Eliminate A,B and E (no need of perfect tense IMO)

In D you already mention 'method', so that would be referring it twice.

Only C is left.
Top
Join the discussion
Senior | Next Rank: 100 Posts
Posts: 99
Joined: Thu Jun 09, 2011 2:09 pm
Thanked: 11 times

by kanwar86 » Wed Nov 30, 2011 10:07 am
IMO, option C is the correct answer
Regards

Kanwar

"In case my post helped, do care to thank. Happy learning :)"
Top
Join the discussion
Junior | Next Rank: 30 Posts
Posts: 24
Joined: Mon Sep 12, 2011 8:51 am
Thanked: 1 times
GMAT Score:650+

by mskgmat » Wed Nov 30, 2011 10:07 am
A. as a method of the extraction of minerals, it was well established
B. as a method of the extraction of minerals well established
Leaching ....,as------- wrong (Must be followed by verb)
C. was a well-established method of mineral extraction
I think C was correct option
D. was a well-established method of extracting mineral that was
D-Wordy
E. had been a method of mineral extraction, well established
E - Wrong tense unnecessary perfect tense
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 239
Joined: Thu Oct 28, 2010 8:40 amFollowed by: 2 members
Location: India
Thanked: 5 times
GMAT Score:690

Re: Leeaching problem

by Dean Jones » Sat Dec 03, 2011 7:16 am
OA is option C. But since this was 25 years ago can't we use past prefect tense? I thought did not realize is past tense. Can somebody please explain?
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 127
Joined: Mon May 11, 2009 10:04 am
Thanked: 5 times

by apex231 » Sat Dec 10, 2011 5:06 am
Can someone explain why use of past perfect tense is wrong in option E in this question?

In the question below, correct option has past perfect tense -

Some historians estimate that in the Great Chicago Fire of 1871, twice as much acreage was destroyed than had earlier been ravaged in Napoleon ’ s Moscow burnings of 1812 and the Great Fire of London of 1666 combined.

than had earlier been
than the amount that was earlier
over the amount that was previously
as had earlier been
as was

OA D
Top
Join the discussion