BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

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.

★★★★★5.0559 reviews
GMATBootcamp Starts Sep 21
Chris Peckover, Target Test Prep GMAT expert
LIVE ONLINE BOOTCAMP

Live Online Bootcamp Class with Top GMAT Expert Chris Peckover

Sep 21 to Oct 9, 2026

Schedule
Mon to Fri · 7:00 to 10:00 PM ET
Included
Live classes + 6 months of TTP OnDemand
  • Boost your GMAT score in less than one month in a live online class
  • 6 months access to TTP OnDemand video courses included
View bootcamp & enroll
Limited cohort · enrollment openTarget Test Prep
EALiveTeach 5 seats left
Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

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
Limited cohort · enrollment openTarget Test Prep
GMATOnDemand Start 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 559 reviewsTarget Test Prep

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

Doubt the Official answer.

Expert replies
Post new topic Locked
Previous Topic Next Topic
User avatar
Master | Next Rank: 500 Posts
Posts: 261
Joined: Wed Mar 31, 2010 8:37 pmFollowed by: 3 members
Location: Varanasi
Thanked: 11 times
by ankur.agrawal » Tue Mar 22, 2011 1:07 am
In the 18th century, Antoine Lavoisier demonstrated that combustion consumes oxygen; previously, many scientists had believed that combustion released phlogiston, an imaginary substance that was believed to extinguish flames.


consumes oxygen; previously, many scientists had believed that combustion released phlogiston, an imaginary substance that was believed to extinguish flames

consumed oxygen, and many scientists had previously believed that phlogiston was an imaginary substance released by combustion, which extinguished flames

consumes oxygen; phlogiston was previously an imaginary substance that was believed to extinguish flames and that many scientists had believed was released by combustion

consumed oxygen; phlogiston, an imaginary substance that extinguished flames, was believed by scientists to be released by combustion

consumes oxygen; previously, many scientists had believed that phlogiston was released by combustion and was an imaginary substance that was believed to extinguish flames.

OA after some discussion.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Sentence Correction |
Legendary Member
Posts: 2326
Joined: Mon Jul 28, 2008 3:54 amFollowed by: 2 members
Thanked: 173 times
GMAT Score:710

by gmatmachoman » Tue Mar 22, 2011 1:16 am
IMO A.

E looks close but alters the intended meaning.

Original sentence properly uses past perfect to show the sequence of events ( had believed....... &....... demonstrated)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 1101
Joined: Fri Jan 28, 2011 7:26 amFollowed by: 13 members
Thanked: 47 times
GMAT Score:640

by HSPA » Tue Mar 22, 2011 1:27 am
+1 for A

combustion consumes oxygen is one pack of words.. so please ignore consumed

E) phlogiston was released "during" combustion; lengthy.. phlogiston or i guess CO2 was released and was an imaginary substance

what is the right word to go with combustion... is it during combustion or in combustion???
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 857
Joined: Wed Aug 25, 2010 1:36 amFollowed by: 15 members
Thanked: 56 times

by AIM GMAT » Tue Mar 22, 2011 1:52 am
IMO A.

consumes oxygen; previously, many scientists had believed that combustion released phlogiston, an imaginary substance that was believed to extinguish flames

consumed oxygen, and many scientists had previously believed that phlogiston was an imaginary substance released by combustion, which extinguished flames --- wrong use of which

consumes oxygen; phlogiston was previously an imaginary substance that was believed to extinguish flames and that many scientists had believed was released by combustion --- changes meaning + non parallel structure

consumed oxygen; phlogiston, an imaginary substance that extinguished flames, was believed by scientists to be released by combustion --- passive

consumes oxygen; previously, many scientists had believed that phlogiston was released by combustion and was an imaginary substance that was believed to extinguish flames. --- changes meaning
Thanks & Regards,
AIM GMAT
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 1083
Joined: Wed Feb 24, 2010 9:38 pmFollowed by: 14 members
Thanked: 127 times

by gmat_perfect » Tue Mar 22, 2011 5:06 am
ankur.agrawal wrote:In the 18th century, Antoine Lavoisier demonstrated that combustion consumes oxygen; previously, many scientists had believed that combustion released phlogiston, an imaginary substance that was believed to extinguish flames.


consumes oxygen; previously, many scientists had believed that combustion released phlogiston, an imaginary substance that was believed to extinguish flames

consumed oxygen, and many scientists had previously believed that phlogiston was an imaginary substance released by combustion, which extinguished flames

consumes oxygen; phlogiston was previously an imaginary substance that was believed to extinguish flames and that many scientists had believed was released by combustion

consumed oxygen; phlogiston, an imaginary substance that extinguished flames, was believed by scientists to be released by combustion

consumes oxygen; previously, many scientists had believed that phlogiston was released by combustion and was an imaginary substance that was believed to extinguish flames.

OA after some discussion.
C,D,and E can easily be eliminated.

B, which has wrongly used "which", is wrong for changing the intended meaning of the sentence.

.........combustion, which extinguish flames... it means that "combustion extinguish flames". Combustion is the process of burning. Can a process of burning extinguish flames. Nope.

Answer is thus A.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Master | Next Rank: 500 Posts
Posts: 261
Joined: Wed Mar 31, 2010 8:37 pmFollowed by: 3 members
Location: Varanasi
Thanked: 11 times

by ankur.agrawal » Tue Mar 22, 2011 8:09 am
OA is A.

Thanks everybody.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 35
Joined: Thu Dec 23, 2010 7:38 pm

by gmat1978 » Mon Jul 18, 2011 6:41 pm
I have a couple of questions about the past perfect tense used in answer choice A. Why do we need the past perfect to clarify the sequence of events (believed and demonstrated)? In this case, doesn't the use of "Previously" clearly state that "believed" happened before "demonstrated"? Don't we use past perfect only if it is necessary to clarify the sequence? Please help.

Many thanks.
gmatmachoman wrote:IMO A.

E looks close but alters the intended meaning.

Original sentence properly uses past perfect to show the sequence of events ( had believed....... &....... demonstrated)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Locked
• Page 1 of 1