Question

The microphone, /which he chose to use/ ,did not work well.

Answer 1

The microphone, /which he chose to use/, did not work well.

Identify the term that best describes the italicized words.

adjectival clause

An adjectival clause is a dependent clause that, like an adjective, modifies a noun or pronoun. In this case, the adjectival clause  which he chose to use modifies the noun microphone.