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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For some birds the sense of smell appears to play a role in [#permalink]

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26 Feb 2006, 16:49
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309. 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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26 Feb 2006, 18:19
B for me

IMO, there is no need to use past tense so A, C, D are out

Also we are only talking about 'homing' so 'difficulties' in E is incorrect
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26 Feb 2006, 19:41
Tough call between A & B. Will go for B.
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28 Feb 2006, 08:48
Isnt "increased difficulties" an incorrect idiom? "difficulty" seems more right.
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02 Mar 2006, 07:59
Assuming the pigeons have flown their last mile, I`ll take (A).
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02 Mar 2006, 12:59
^ A ^

I dont see anything wrong with the original sentence.
02 Mar 2006, 12:59
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# For some birds the sense of smell appears to play a role in

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