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.

That women didn't belong on a basketball court is a subordinate clause. A subordinate clause must be attached to a main clause. She became so angry is the necessary main clause. When a subordinate clause introduces a main clause, you need a comma between the two.

Go back to the sentence to try again.

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