People ---- the Earth was flat until Aristotle ---- that ...

[ Grammar ]

People —- the Earth was flat until Aristotle —- that it was not.

A. believed / was proving

B. had believed / proved

C. had believed / would prove

D. have believed / proved

Select your answer:

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My brother knows how to fly an airplane. He …….… a pilot.

A. is

B. are

C. am

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What does “pretty as a picture” mean?

A. something is ugly

B. something you have a picture of

C. something is beautiful

D. something is in the shape of a frame