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Need help on solving the following problem

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Need help on solving the following problem

by Shridharvk » Thu Jul 08, 2010 4:48 am
OG12 SC problem: -

70. His studies of ice-polished rocks in his Alpine
homeland, far outside the range of present-day
glaciers, led Louis Agassiz in 1837 to propose the
concept of an age in which great ice sheets had
existed in now currently temperate areas.
(A) in which great ice sheets had existed in now
currently temperate areas
(B) in which great ice sheets existed in what are
now temperate areas
(C) when great ice sheets existed where there were
areas now temperate
(D) when great ice sheets had existed in current
temperate areas
(E) when great ice sheets existed in areas now that
are temperate

I am just wondering why past perfect should not be used here?
I chose option 'D'.
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by dream700 » Thu Jul 08, 2010 5:25 am
A past perfect tense is to be used when there are two things happened at two diff time and you have to explicitely differentiate the order in which they have occured.

Here we don't have to show anything before which the ice age existed. hence simple past tense is correct.
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Junior | Next Rank: 30 Posts
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by Shridharvk » Thu Jul 08, 2010 7:55 pm
Thanks. I got confused because of the presence of "1837". I thought one event has already happened in the past.
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