People (is, are) often ten or twenty years behind the ...

[ Subject-Verb Agreement ]

People (is, are) often ten or twenty years behind the times in their knowledge of the world.

A. Is
B. Are

Select your answer:

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A. A. adjective
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I bought a computer. My mom didn’t like it.

A. I bought a computer that my mom didn’t like.

B. I bought a computer that my mom didn’t like it.

C. I bought a computer which my mom didn’t like it.