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.

Tough and confused parallelism - need the help of expert

Expert replies
Post new topic Locked
Subscribe topic
Previous Topic Next Topic
User avatar
Master | Next Rank: 500 Posts
Posts: 296
Joined: Sun May 29, 2011 5:10 amFollowed by: 5 members
Location: Vietnam
Thanked: 10 times
by tuanquang269 » Sat Nov 19, 2011 8:02 am
I searched this question on google and did not find nothing for the explanation of this question.

The human growth hormone, made by the pituitary gland, is secreted during sleep in higher concentrations than when awake.
(A) during sleep in higher concentrations than when awake
(B) when sleeping in higher concentrations than waking hours
(C) in higher concentrations during sleeping than waking
(D) in higher concentrations during sleep than during waking hours
(E) in higher concentrations when asleep than when awake

OA is D

IMO E
Top
Join the discussion
Source: — Sentence Correction |
User avatar
Master | Next Rank: 500 Posts
Posts: 114
Joined: Fri Oct 08, 2010 10:35 amFollowed by: 2 members
Location: TASHKENT
Thanked: 8 times
GMAT Score:640

by hoji » Sat Nov 19, 2011 9:28 am
some thoughts related to the use of "during"

(BTG)rule: [during+particular time period]

-during two hours, i felt sleepy - incorrect;
-during the past two hours, i felt sleepy - correct.
if we take this rule as granted, then the options in which "during" is used are incorrect! because they don't talk about particular time period, rather they talk about time period in general.

Experts, please shed some light on this!
I know of no more encouraging fact than the unquestionable ability of a man to elevate his life by conscious endeavor.
Henry David Thoreau.

Sleep GMAT, eat GMAT, beat GMAT!
______________________________
Quant ----> 51
Verbal----> 44+
GMAT ----> 750+
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 172
Joined: Wed Jul 09, 2008 3:35 amFollowed by: 1 member
Thanked: 3 times
GMAT Score:610

by karthikgmat » Sat Nov 19, 2011 8:06 pm
confused between D and E
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 172
Joined: Fri Oct 21, 2011 9:10 pmFollowed by: 2 members
Thanked: 7 times

by satishchandra » Sat Nov 19, 2011 10:00 pm
A,B,C violate parallelism. I think we all eliminated those 3 choices in one go.

Now, Between D and E

I think both are not looking good

D) during sleeping hours than during waking hours is correct parallelsm. But do we ever say waking hours?

E) does not seem to be good either

when one is asleep than when one is awake makes correct sense.

What's the source of this question?
Top
Join the discussion
User avatar
Master | Next Rank: 500 Posts
Posts: 377
Joined: Wed Sep 14, 2011 10:45 amFollowed by: 1 member
Thanked: 10 times

by imskpwr » Sat Nov 19, 2011 10:44 pm
I think both D & E are incorrect as there is ambiguity.

In D Comparison is made bw
High concentration during Sleeping Hour.
High concentration during Waking Hour.(doesn't look correct as meaning changed)

Similar construction is used in E.
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 » Sun Nov 20, 2011 1:43 am
'When' and 'Where' should always refer to a time period and place respectively.

E uses 'When' but does not have any time period associated to it.

'Asleep' is not a time period while 'During sleep' is.
Top
Join the discussion
Legendary Member
Posts: 1574
Joined: Fri Jan 28, 2011 2:52 amFollowed by: 13 members
Thanked: 88 times

by aspirant2011 » Sun Nov 20, 2011 8:22 am
I think E changes the intended meaning......
Top
Join the discussion
User avatar
GMAT Instructor
Posts: 641
Joined: Wed Jul 22, 2009 3:07 pmFollowed by: 45 members
Location: Madison, WI
Thanked: 162 times
GMAT Score:760

by Jim@Grockit » Sun Nov 20, 2011 11:40 pm
Choice E has the growth hormone asleep and awake, which is contrary to modern science.
Top
Join the discussion
Master | Next Rank: 500 Posts
Posts: 138
Joined: Thu Nov 12, 2009 10:07 amFollowed by: 3 members
Thanked: 19 times

by GmatVerbal » Mon Nov 21, 2011 11:24 am
I have seen couple of OG questions testing difference between during and when;

my observation is 'when' normally starts a subordinate clause,but if it starts a phrase, care must be taken as 'when ' gets attached to subject of the main clause;

asleep and awake are adjectives they get attached to subject 'human growth hormone';

during is a preposition with noun objects sleep and walking hours;
Top
Join the discussion
User avatar
GMAT Instructor
Posts: 3224
Joined: Tue Jan 08, 2008 2:40 pmFollowed by: 614 members
Location: Toronto
Thanked: 1710 times
GMAT Score:800

by Stuart@KaplanGMAT » Mon Nov 21, 2011 3:37 pm
Hi,

none of the answers are very good; it's very helpful for the BTG community to know the source of all of your questions (so you should always include the source when you make a new post) - where does this one come from?
Image

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

Kaplan Exclusive: The Official Test Day Experience | Ready to Take a Free Practice Test? | Kaplan/Beat the GMAT Member Discount
BTG100 for $100 off a full course
Top
Join the discussion
Junior | Next Rank: 30 Posts
Posts: 19
Joined: Wed Nov 10, 2010 5:05 am
Location: India

by rajeevrks27 » Thu Nov 24, 2011 5:15 am
d seems to be the best out of worst I believe
Fire the final bullet only when you are constantly hitting the Bull's eye...till then KEEP PRACTISING...
Top
Join the discussion
User avatar
Master | Next Rank: 500 Posts
Posts: 296
Joined: Sun May 29, 2011 5:10 amFollowed by: 5 members
Location: Vietnam
Thanked: 10 times

by tuanquang269 » Thu Nov 24, 2011 7:34 am
Sorry all guy, my internet cable has problem in recent day. I confronted this question from SC1000.

Besides, can any one help me to summarize the use of when/during in all cases?
Top
Join the discussion