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.

Expert replies
Post new topic Locked
Subscribe topic
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 38
Joined: Sat Nov 08, 2008 4:36 am
by sumittaneja009 » Mon Dec 29, 2008 10:05 pm
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

OA is C
Top
Join the discussion
Source: — Sentence Correction |
User avatar
Legendary Member
Posts: 546
Joined: Sun Nov 16, 2008 11:00 pm
Location: New Delhi , India
Thanked: 13 times

by ronniecoleman » Tue Dec 30, 2008 2:52 am
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
awkward construction: it refers to whom...

(B) as a method of the extraction of minerals well established
proper verb is required..
(C) was a well-established method of mineral extraction
Bingo..
(D) was a well-established method of extracting mineral that was
that illogically modifies mineral

(E) had been a method of mineral extraction, well established
wrong use of tense
Admission champion, Hauz khaz
011-27565856
Top
Join the discussion
Senior | Next Rank: 100 Posts
Posts: 76
Joined: Fri Dec 11, 2009 1:37 am

by er_priyankajolly » Wed Aug 18, 2010 11:16 pm
This is a GMAT Prep2 Question

Can anyone explain me why "Had been in E is incorrect".

I have read in a few posts that "well established" is incorrectly modifying mineral extraction. However, i believe that its modifying method of mineral extaction.

please correct me if i am wrong
Top
Join the discussion
Junior | Next Rank: 30 Posts
Posts: 21
Joined: Wed Sep 07, 2011 6:51 am

by crack30 » Sat Sep 24, 2011 2:25 am
can some one explain as eaarly as 18c should modify what, in logic? and why Dis wrong?
Top
Join the discussion
Senior | Next Rank: 100 Posts
Posts: 61
Joined: Sun Mar 13, 2011 12:34 pm
Thanked: 1 times

by luiscarlos59 » Sun Mar 04, 2012 2:50 pm
D is wrong because

Leaching...was a method of extracting mineral that was as early as 18c..

No sense at all.


Leaching...was a method of mineral extraction as early as 18c..

Correct
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 143
Joined: Mon Mar 14, 2011 3:13 amFollowed by: 5 members
Thanked: 34 times

by krusta80 » Sun Mar 04, 2012 3:18 pm
crack30 wrote:can some one explain as eaarly as 18c should modify what, in logic? and why Dis wrong?
Choice C is much more to the point. It's less wordy and avoids using an unnecessary gerund.
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 143
Joined: Mon Mar 14, 2011 3:13 amFollowed by: 5 members
Thanked: 34 times

by krusta80 » Sun Mar 04, 2012 3:20 pm
er_priyankajolly wrote:This is a GMAT Prep2 Question

Can anyone explain me why "Had been in E is incorrect".

I have read in a few posts that "well established" is incorrectly modifying mineral extraction. However, i believe that its modifying method of mineral extaction.

please correct me if i am wrong
You only want to use had been, which is the past perfect, is the rest of that clause refers to actions taken during the past as well.
Top
Join the discussion
Legendary Member
Posts: 2789
Joined: Tue Jul 26, 2011 12:19 amFollowed by: 43 members
Location: Chennai, India
Thanked: 206 times
GMAT Score:640

by GmatKiss » Mon Mar 05, 2012 2:20 am
sumittaneja009 wrote: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 - Perfect
(D) was a well-established method of extracting mineral that was - Passive
(E) had been a method of mineral extraction, well established

OA is C
Top
Join the discussion
Legendary Member
Posts: 627
Joined: Thu Jun 23, 2011 9:12 amFollowed by: 1 member
Thanked: 4 times

by mankey » Mon Mar 05, 2012 11:01 pm
Please explain, what is the problem with D?

Regards
Top
Join the discussion
Legendary Member
Posts: 641
Joined: Wed Apr 20, 2011 1:15 amFollowed by: 32 members
Thanked: 149 times
GMAT Score:760

by avik.ch » Tue Mar 06, 2012 12:33 am
mankey wrote:Please explain, what is the problem with D?

Regards
- Prefer a dedicated noun of a verb over its gerund. For some verb when dedicated noun do not exists, use its gerund form.

- What is "that" referring to "method of...." or "extracting mineral" ? there is an ambiguity.

Hope this helps !!
Top
Join the discussion