One day， when we were having a math exam， I heard Wang Ping who was behind me asking me for the key to a problem。 The teacher was in the front of the classroom and I was not sure about my solution， so I didn't answer him。 After the exam， he went out with other friends without saying anything to me。
一天，当我们乒在进行数学考试时，我．听见后边的王平跟我要一道题的`答案。老师在教室前面，而且我对自己的答案没有把握，所以我没有回答他。考试之后，他什么也没说，就和其他朋友出去了。
