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      Question

      ┬аFill in the blanks with appropriate words/phrases

      from the options. The association of 226 viruses responsible for zoonotic diseases ______________ by the researchers and more than 800 mammal species _____________ by them.
      A had surveyed, had been distinguished Correct Answer Incorrect Answer
      B had been surveyed, had been distinguished Correct Answer Incorrect Answer
      C had been surveyed, had distinguished Correct Answer Incorrect Answer
      D has being surveyed, has being distinguished Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Only option B is grammatically correct. The association of 226 viruses responsible for zoonotic diseases had been surveyed by the researchers and more than 800 mammal species had been distinguished by them.

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