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听力原文:M: Prof. Black has been very busy this semester. As far as I know, he works until
W: I wouldn't have troubled him so much if I had known he was so busy.
Q: What do we learn from the conversation?
(14)
A.The woman has trouble getting along with the professor.
B.The woman regrets having taken up much of the professor's time.
C.The woman knows the professor has been busy.
D.The woman knows the professor has run into trouble.
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)