[ Grammar ]
Scientists think there ________ at least five mass extinctions in Earth’s history.
A. will be
B. are
C. have been
D. has been
Select your answer:
Random Topics:
Pronoun vs. PronounsAntonymsPrepositionsPast and Present ContinuousWh- Questions Present Simple TenseGrammar - Punctuation of SentencesMiscellaneous Grammar UsagesGrammar SuffixesTenses: Present simple, Past Simple, Future Simple
Other quiz:
Relative Pronouns › ViewThis is the garden ____ we can roam the animals.
A. that
B. where
C. when
D. whose
Grammar › View
teacher
A. thing
B. place
C. animal
D. person
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