听力原文:W: Why were you late for music class this morning?M: I'm so sorry. I went to bed
听力原文:W: Why were you late for music class this morning?
M: I'm so sorry. I went to bed too late to hear the alarm this morning.
Why was the man late?
A.He didn't sleep and kept on studying.
B.His alarm clock didn't work.
C.He stayed up late and overslept.