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1.  Which one of the following is correct sentence?

  • A. Many demonstrations have been made in recent years in protest against the level of pollution
  • B. Many demonstrations have been made in recent years in protest against the level of pollution
  • C. Many demonstrations have been made in recent years in protest against the level of pollution
  • D. Many demonstrations have been made in recent years in protest against the level of pollution

Answer: Option B

Explanation:

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