Dinosaurs_____ one of the most well known extinct animals, it's ...

[ Simple Past Tense ]

Dinosaurs_____ one of the most well known extinct animals, it’s believed their extinction ____ caused by the impact of a meteor and/or multiple volcanic eruptions

A. are – was

B. were – is

C. were -was

D. are – is

Select your answer:
A B C D E

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expresses an action that is, was, or will be continually occurring but that it is, was, or will be completed at a later time

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A. are start

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C. start

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A. to go

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