听力原文:W: Professor Johnston has been very busy this month. I've heard that he stays up very late every night. M: If I had known this I wouldn' t have troubled him so much. Q: What do we learn from the conversation? (19)
A.
The man took up much of the professor's time.
B.
The man didn't make any trouble with Prof. Johnston.
C.
The man has trouble getting along with Prof. Johnston.