Here is the item:
Christine wrang her hands as she listened to Professor Armour's lecture about tardiness. Although Christine swore to her algebra teacher that she would never be late again, everyone in the class knew that when the alarm clock rang the next morning, Christine would hit the snooze button one time too many.

The first verb, wrang, is the problem. As you know, the sentence requires the simple past. Wrung is the correctly spelled form.

Verb Simple
Present
Simple
Past
Past
Participle
wring wring(s) wrung wrung

Go to the next item.