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.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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