Is the verb in the sentence in the active voice or the passive voice? The black car was polished to a velvety sheen.

The verb "was polished" in the sentence presented above is in its active voice. A verb is in the active voice when the subject is the doer of the action. On the other hand, if the subject is the receiver of the action, it is said to be in the passive voice.

Passive voice. "the black car" is in the place of the subject, but it was not the car that did the action.