Take another look at the sentence:

When Millie overheard Coach Jones complain that women didn't belong on a basketball court, she became so angry that she picked up a tennis racket and whacked him over the head, the assault and battery charge, in Millie's opinion, was worth it.

The assault and battery charge was worth it is a main clause that can stand alone as a complete sentence. In Millie's opinion is an interrupter. Since it is breaking the flow of the sentence, you must use a comma both in front of the phrase and behind it.

Go back to the sentence to try again.

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