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