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 correct answer is The haunting refrain stayed with the audience long after the show ended.

Explanation:

Used as a noun, refrain is a chorus of musical piece.

A noun is a kind of word we use to identify an inanimate object or being.

In the sentence “The haunting refrain stayed with the audience long after the show ended.” We can see how the word refrain is the main object, being the word stayed the verb of the sentence. While in the other sentences it works like a verb.

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