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    Question

     Fill 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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