参考答案

正确答案：C
解析：[听力原文]
W: Yang, would you mind looking after my children this afternoon while I am going shopping?
M: I'm sorry, but I have a part-time job, helping a foreign student with his English this afternoon.
Q: Why can't Yang look after the children?
由选项推测本题与he要做的事情有关。女士请求男士帮她照看孩子，男士回答说他要给一个外国学生辅导英语，故正确答案为C)。