Climate change could _____ the survival of blue whales. ... | GrammarQuiz.net

Topics: Grammar Modals

Climate change could _____ the survival of blue whales.

A. being threat

B. threaten

C. have been threatened

D. threat

Select your answer:

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Present Continous Tense Coordinating Conjunctions Past Perfect and Past Perfect Continuous Tense Passive Modals, Impersonal Passive Auxiliary Verbs, if, unless and Modal Grammar (Possessive Pronouns)Perfect Tenses and, so, but, because Have to Uncountable Nouns

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He used to _________ very shy until he gained confidence.

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