单项选择题
[听力原文]
Woman: I haven’t seen you for ages! Where have you been
Man: Actually, I have been doing research recently. I have to stay in the lab almost all the time. I’m happy to tell you that the work is successful.
A.He is doing research.
B.He works long hours in the lab.
C.He is making progress.
D.He was unhappy until recently.