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

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

work of mathematician - 1000SC

Expert replies
by mehravikas » Mon Nov 23, 2009 12:53 pm
The work of mathematician Roger Penrose in the early 1970s, on the geometry of what are called aperiodic tiles, turned out to describe the architecture of a previously unknown class of crystals.

(A) what are called aperiodic tiles, turned out to describe
(B) what is called aperiodic tiles, describes
(C) aperiodic tiles, describing
(D) so-called aperiodic tiles, describe
(E) aperiodic tiles, it turned out to describe

OA: A
Doubt: [spoiler]The subject is "work" therefore I thought it should use "describes".[/spoiler]

It has been discussed before on this forum but I am not convinced with the reason to eliminate B
Join the discussion
Source: — Sentence Correction |

by sunnyjohn » Mon Nov 23, 2009 6:19 pm
I choose A, i was stuck with A and B.

the reason i eliminated B : what IS called aperiodic tileS?
I though "what ARE called aperiodic tileS?" --> gives a better S-V agreement.

in A, I think it is ok...to write..

The work(Subject) of mathematician Roger Penrose in the early 1970s, ..., turned out to describe mathematician Roger Penrose in the early 1970s.

Another reason: Meaning - the work was not intentionally meant to describe the architecture. It happened to describe.
So, B changes the meaning by saying that Work was actually meant to describe the architecture.

thanks
sunny
Join the discussion

by mehravikas » Mon Nov 23, 2009 6:36 pm
IMO -

1. The work....turned out to describe
2. The work....describes

Both are correct. I picked B because it was more concise and I thought "is" refers to the work. But I was wrong. "What are" seems to be the correct usage.

However I think that both the forms (1 and 2) are correct in terms of describing the work. Gramatically I don't see a problem in them.

sunnyjohn wrote:I choose A, i was stuck with A and B.

the reason i eliminated B : what IS called aperiodic tileS?
I though "what ARE called aperiodic tileS?" --> gives a better S-V agreement.

in A, I think it is ok...to write..

The work(Subject) of mathematician Roger Penrose in the early 1970s, ..., turned out to describe mathematician Roger Penrose in the early 1970s.

Another reason: Meaning - the work was not intentionally meant to describe the architecture. It happened to describe.
So, B changes the meaning by saying that Work was actually meant to describe the architecture.

thanks
sunny
Join the discussion

by sunnyjohn » Mon Nov 23, 2009 6:58 pm
IMO -

1. The work....turned out to describe
2. The work....describes

Both are correct. I picked B because it was more concise and I thought "is" refers to the work. But I was wrong. "What are" seems to be the correct usage.

However I think that both the forms (1 and 2) are correct in terms of describing the work. Gramatically I don't see a problem in them.

I agree that both are grammatical correct, but if you see his original work was on 'aperiodic tiles' which happened to describe the architecture of crystal.
the work on aperiodic tiles turned out to describe the architecture of crystals.
the work on aperiodic tiles describes the architecture of crystals.



I hope some expect will clarify this more clearly, whether there is any difference in meaning?
Join the discussion

by tanviet » Tue Nov 24, 2009 2:50 am
check grammar, c, d and e are out

when any 2 choices are grammatical, keep the original meaning. A is left.
Join the discussion

• Page 1 of 1