Multiple choice

For some mammals the sense of hearing seems to play a role in maintaining bearings, since mice with surgically removed cochlear nerve were found to have increased difficulties in staying balanced.

  1. were found to have increased difficulties

  2. have been found to have increased difficulty

  3. were found to have increasing difficulty

  4. had been found to have increased difficulties

  5. have been found to have increasing difficulties
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the second part of the sentence, "since" is used so we should use has/have. This leaves us with options (2) and (5). Option (5) can be eliminated because of "increasing". Besides in the context 'difficulty' is the usage of choice. Hence (2)

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