一天,蒂姆的数学老师看了他的作业,发现他全做对了。老师很高兴,同时也十分惊讶。他把蒂姆叫到桌前说:“蒂姆,你这次的作业全都做对了,怎么回事?你爸爸帮你做了吗?” One day, Tim’s math teacher looked at his homework and found that he was all right. The teacher was very happy and surprised. He called Tim to the table and said: “Tim, you’ve done your homework this time. What’s the matter? Did your father help you?”