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# Industrialisation and modern methods of insect control have

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Intern
Joined: 03 Jul 2006
Posts: 9

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Location: India
Industrialisation and modern methods of insect control have [#permalink]

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15 Jul 2006, 09:41
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Industrialisation and modern methods of insect control have improved the standard of living around the globe while at the same time they have introduced 10000 dangerous chemical pollutants, having gone virtually unregulated since they were developed more than 50 years ago.

a) while at the same time they have introduced 10000 chemical pollutants ,having
b)while at the same time introducing some 10000 dangerous chemical pollutants that have
c) while they have introduced some 100000 dangerous chemical pollutants at the same time , which have
d) but introducing some 10000 dangerous chemical pollutants at the same time that have

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Senior Manager
Joined: 07 Mar 2006
Posts: 351

Kudos [?]: 37 [0], given: 1

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16 Jul 2006, 06:45
A seems to be parallel.
Have improved....have introduced.

But , i find none of the answers convincing as it seems to suggest that chemical pollutants have gone unregulated and chemical pollutants were developed some 50yrs ago.

Kudos [?]: 37 [0], given: 1

GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5034

Kudos [?]: 437 [0], given: 0

Location: Singapore

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17 Jul 2006, 02:18
a,c - 'they' has not clear referent

d - awkward

b is best.

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SVP
Joined: 30 Mar 2006
Posts: 1728

Kudos [?]: 98 [0], given: 0

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17 Jul 2006, 04:05
B is the best of the worst.
Can still pick out some problems with B but other options have many more problems.

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Intern
Joined: 03 Jul 2006
Posts: 9

Kudos [?]: [0], given: 0

Location: India

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17 Jul 2006, 06:12
OA is B. Please explain as to why it is not A. 'they' has only one antecedent and it seems to be parallel.
Did not include answer choice E) since it was clearly out.

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Manager
Joined: 05 Jun 2006
Posts: 111

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Location: London

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19 Jul 2006, 07:00
B is not parallel. How can it be the correct answer (not implying the others are correct either - but B is definately not parallel)

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Senior Manager
Joined: 20 Feb 2006
Posts: 331

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19 Jul 2006, 13:16
xsports wrote:
B is not parallel. How can it be the correct answer (not implying the others are correct either - but B is definately not parallel)

I also think B is wrong.. I vote for C..

Also, while and sametime go togethor ? while already means same time..

Kudos [?]: 108 [0], given: 0

19 Jul 2006, 13:16
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