New strains of the flu that appear each year can often be very __________________, which is why the Centers for Disease Control continue to recommend vaccinations. A. indomitable B. diffident C. virulent D. truculent - Vocabulary | English Grammar Quiz

New strains of the flu that appear each year can often be very __________________, which is why the Centers for Disease Control continue to recommend vaccinations.

A. indomitable

B. diffident

C. virulent

D. truculent

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