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      Question

      Select the most appropriate option that can substitute

      the bold segment in the given sentence to improve it. If no improvement is required, select ‘No improvement required’. The pollution level ought to keep under control.
      A ought to be kept Correct Answer Incorrect Answer
      B ought to have kept Correct Answer Incorrect Answer
      C No improvement required Correct Answer Incorrect Answer
      D ought to be keeping Correct Answer Incorrect Answer

      Solution

      The correct answer is A

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