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

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

Public health concern

Expert replies
by Dean Jones » Sat Dec 03, 2011 11:29 am
Dear Friends,

I was having problems in answering the following question.

Concerns about public health led to the construction between 1876 and 1904 of three
separate sewer systems to serve
metropolitan Boston.

A. Concerns about public health led to the construction between 1876 and 1904 of three
separate sewer systems to serve
B. Concerns about public health have led to the construction of three separate sewer
systems between 1876 and 1904 to serve
C. Concerns about public health have led between 1876 and 1904 to the construction of
three separate sewer systems for serving
D. There were concerns about public health leading to the construction between 1876
and 1904 of three separate sewer systems serving
E. There were concerns leading between 1876 and 1904 to the construction of three
separate sewer systems for serving


Please help.

OA after some discussions.

My choice was option A

Regards
Deano.
Join the discussion
Source: — Sentence Correction |

by bharti.2010 » Sat Dec 03, 2011 3:51 pm
IMO- B
Join the discussion

by chufus » Sat Dec 03, 2011 7:17 pm
A should be the correct answer.

B implies that "between x & Y" were serving the metropolis. The rest are non sensical.

Is "A" the original answer ?
Join the discussion

by patanjali.purpose » Sun Dec 04, 2011 2:51 am
Dean Jones wrote:Dear Friends,

I was having problems in answering the following question.

Concerns about public health led to the construction between 1876 and 1904 of three
separate sewer systems to serve
metropolitan Boston.

A. Concerns about public health led to the construction between 1876 and 1904 of three
separate sewer systems to serve
B. Concerns about public health have led to the construction of three separate sewer
systems between 1876 and 1904 to serve
C. Concerns about public health have led between 1876 and 1904 to the construction of
three separate sewer systems for serving
D. There were concerns about public health leading to the construction between 1876
and 1904 of three separate sewer systems serving
E. There were concerns leading between 1876 and 1904 to the construction of three
separate sewer systems for serving
We require past tense, not HAVE LED - drop B/C

D - it appears LEADING modifies public health (or it could modify CONCERNS as well). If it modifies PUBLIC HEALTH thn its incorrect (as it will change the original meaning of sentence). If it modifies CONCERNS thn we have an ambiguity. Drop it

E - Placement of modifier 'between 1876 and 1904' is inappropriate. It should be closer to THE CONSTRUCTION. Drop it

IMO A (in general TO SERVE, Signifies PURPOSE OR INTENT OF STH. Here also, TO SERVE shows that THE CONSTRUCTION was done with an intent to SERVE BOSTON). Having said that, this construction appears awkward to me...but still IMO A
Join the discussion

by sk8legend408 » Sun Dec 04, 2011 5:18 am
I agree with patanjali...the answer should be A

What's the OA?
Join the discussion

by Dean Jones » Sun Dec 11, 2011 7:55 am
OA is option A
Join the discussion