Astronomers haven't _______ signs of life in space. A. ... | GrammarQuiz.Net

[ Vocabulary and Grammar ]

Astronomers haven’t _______ signs of life in space.

A. see

B. saw

C. seen

Select your answer:
A B C D E

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Can, Could, May, Might Articles with Proper Nouns used to vs be used to vs get used to Past Simple, Past Continuous, Past Perfect, Past Perfect Continuous Phrasal Verbs and Verb Forms Sentences vs Run-Ons Indefinite Article TOEIC Grammar and Vocabulary Review Noun and Pronoun Verb Agreement

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B. come

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