听下面一段对话,回答第14至第l7题。
Why does David go to Professor Smith for help?
A.He missed all the classes last week. B.He had trouble with today' s lecture. C.He wanted to learn how to take notes.
参考答案:
答案解析:
What is the probable relationship between the speakers?
What is the probable relationship between the speakers?A.Customer and waiter. B.