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For some birds the sense of smell appears to play a role in [#permalink]
28 Jun 2004, 01:23
This post was BOOKMARKED
90% (01:46) correct
10% (01:10) wrong based on 4 sessions
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 _________________
I'm crossing the bridge.........
I think that error is more to do with using increasing ( continuous tense) compared with increased, which is better.
I couldn't understand how using the plural difficulties introduces an error. -ash
present perfect tense is used for an action that extends from past to present. Here, it's been proved that if we remove the olfactory organs of a pigeon, it will find difficulty in homing. past --> still valid.
E entails present continuous tense. Does that mean difficulty is increasing steadily?? that doesn't hold good.
I don't think 'difficulties plays any role here in chosing the answer.
First, "increasing" in E is not right. Simply put, you compare two sets of data: one in which birds have little difficulty in homing and the other in which birds have more difficulty. The difficulty is "enreased", not "encreasing."
Seconds, "difficulty" should be used here.
(A) were found to have increased difficulties (B) have been found to have increased difficulty (C) were found to have increasing difficulty
I believe that were means that the action has happend in the past and finished, while the experimaent is still valid until now so we have to use the past percfet. I hope this will help. _________________
-Genius is one percent inspiration, and ninety-nine percent perspiration.
Re: For some birds the sense of smell appears to play a role in [#permalink]
22 Jan 2014, 10:37
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Re: For some birds the sense of smell appears to play a role in
22 Jan 2014, 10:37