单项选择题

W: Don’t you have any good news
M: No. Yesterday, I had to stay after school, because I was talking during my biology teacher’s class.
W: You’d better keep quiet during class.
M: Sometimes I do. The day before yesterday, I was very quiet during my history teacher’s class and I still had to stay after class.
W: I don’t understand.
M: Because I fell asleep during his class. But it wasn’t my fault. The lesson was very dull.
W: I advise you to take school more seriously. If you don’t pass your exam, you’ll have to go out and work as a result.
M: I don’t see that it makes much difference. If I have a job, I have to do dull work every day, but if I’m in school, I must listen to dull teachers every day.

What did the boy often do at school()

A. He was often late for school.
B. He often fell asleep in class.
C. He often stayed after class.