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Industrialisation and modern methods of insect control have

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Industrialisation and modern methods of insect control have [#permalink] New post 15 Jul 2006, 08:41
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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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 [#permalink] New post 16 Jul 2006, 05:45
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.
Comments are welcome. :)
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 [#permalink] New post 17 Jul 2006, 01:18
a,c - 'they' has not clear referent

d - awkward

b is best.
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 [#permalink] New post 17 Jul 2006, 03:05
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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 [#permalink] New post 17 Jul 2006, 05:12
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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 [#permalink] New post 19 Jul 2006, 06:00
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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 [#permalink] New post 19 Jul 2006, 12:16
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..
  [#permalink] 19 Jul 2006, 12:16
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