New strains of the flu that appear each year can ...

[ Vocabulary ]

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

Select your answer:

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Infinitives and Gerunds Passive Voice in Past Simple Tense Reflexive pronouns Although, Though, In spite of, Despite Mixed Grammar Modals of Advice Modal Auxiliaries Present tense Affirmative Comparatives, Superlatives & Equatives

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