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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 โ€˜No improvement requiredโ€™. 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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