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# The growth of the railroads led to the abolition of local

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Director
Joined: 14 Jul 2004
Posts: 698

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The growth of the railroads led to the abolition of local [#permalink]

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23 Jul 2004, 10:53
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The growth of the railroads led to the abolition of local times, which was determined by when the sun reached the observerâ€™s meridian and differing from city to city, and to the establishment of regional times.

(A) which was determined by when the sun reached the observerâ€™s meridian and differing
(B) which was determined by when the sun reached the observerâ€™s meridian and which differed
(C) which were determined by when the sun reached the observerâ€™s meridian and differing
(D) determined by when the sun reached the observerâ€™s meridian and differed
(E) determined by when the sun reached the observerâ€™s meridian and differing

Questions:

How do you know when to use "which was" and when not to use it?

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SVP
Joined: 16 Oct 2003
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23 Jul 2004, 11:18
B?

this non-restrictive clause can be removed. It just describes local time.

The growth of the railroads led to the abolition of local times, which was determined by when the sun reached the observerâ€™s meridian and which differed from city to city, and to the establishment of regional times.

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Director
Joined: 13 Nov 2003
Posts: 957

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Location: Florida

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23 Jul 2004, 13:05
there are 3 parts of this sentence:

1)The growth of the railroads led to the abolition of local times,
2)which was determined by when the sun reached the observerâ€™s meridian and differing from city to city,
3)and to the establishment of regional times.

if you use "which" (2nd), then "and" (3rd) would refer to local times. 2nd is the parenthetical/appositive element to the first, it just adds to already provided information (local times). Even if you remove 2nd, it doesn't harm the structure of the sentence.

"...to the abolition of local times and to the establishment..."

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Director
Joined: 01 Feb 2003
Posts: 838

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24 Jul 2004, 09:03
Excellent explanations here:

http://www.gmatclub.com/phpbb/viewtopic ... +differing

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24 Jul 2004, 09:03
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# The growth of the railroads led to the abolition of local

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