Reason of Punishment

One day a little girl came home from school, and said to her mother, Mommy, today in school I was punished for something that I didn't do.The mother exclaimed, But that's terrible! I'm going to have a talk with your teacher about this! By the way, what was it that you didn't do?The little girl replied, My homework.一天，小女孩从学校回到家里，对妈妈说：妈妈，今天在学校里我因为一件我没有做的事情而受到惩罚。妈妈激动地说：那真是太可怕了！我要跟你的老师好好谈一谈，对了，你没有做过的那件事是什么？小女孩回答说：我的家庭作业。