For some birds the sense of smell appears to play a role in : GMAT Sentence Correction (SC)
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# For some birds the sense of smell appears to play a role in

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SVP
Joined: 28 May 2005
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For some birds the sense of smell appears to play a role in [#permalink]

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29 Oct 2005, 05:07
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19. For some birds the sense of smell appears to play a role in navigation, since pigeons with surgically removed olfactory nerves were found to have increased difficulties in homing.
(A) were found to have increased difficulties
(B) have been found to have increased difficulty
(C) were found to have increasing difficulty
(D) had been found to have increased difficulties
(E) have been found to have increasing difficulties
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29 Oct 2005, 05:20
B for the correct S-V agreement. Also we need a present perfect tense + passive voice to demonstrate a phenomenon.
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29 Oct 2005, 07:11
GMATT73 wrote:
B for the correct S-V agreement. Also we need a present perfect tense + passive voice to demonstrate a phenomenon.

Is it a phenomenon?

IMO, it's an experiment.
An experiment is conducted once in the past.

I vote for (A).
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29 Oct 2005, 07:18
Right you are again gamjatang! Amazing how much accuracy one loses after just a couple days off...
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30 Oct 2005, 00:31
I am confused between A and C.

Can someone pl. explain both the choices?
SVP
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03 Nov 2005, 11:19
OA is A . good job guys.
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03 Nov 2005, 11:19
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# For some birds the sense of smell appears to play a role in

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