Which sentence uses refrain as a noun? the flight attendant requested that the passengers refrain from smoking. students should refrain from using their cell phones during the lecture. experienced audience members refrain from clapping until the end. the haunting refrain stayed with the audience long after the show ended.

The last one, "The haunting refrain..."

The sentence that uses refrain as a noun is D. The haunting refrain stayed with the audience long after the show ended.

Explanation:

Refrain as a noun -a word that refers to a person, thing, place, event, etc.- can be defined as "a regularly recurring phrase or verse in a poem or song". In sentence D, refrain is used in this sense.

On the other hand, as a verb, refrain means to avoid or stop yourself from doing something. Sentences A, B and C use refrain as a verb.

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