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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Director
Joined: 16 May 2007
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For some birds the sense of smell appears to play a role in [#permalink]

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05 Jul 2007, 18:42
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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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05 Jul 2007, 19:18
A,C - out
D - 'had been' is wrong
E - 'increasing difficulties' is awkward

B is best.
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Joined: 29 Jan 2007
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06 Jul 2007, 13:29
B .

past tense is ruled out because the birds still have problem.

~sara
06 Jul 2007, 13:29
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