听力原文:W: Why didn't you come here yesterday, John?M: I'm sorry, sir. My mother was ill.
听力原文:W: Why didn't you come here yesterday, John?
M: I'm sorry, sir. My mother was ill.
What can we learn from the dialogue?
A.John was expected to come yesterday.
B.John didn't come because he was ill.
C.The man was John's father.