听力原文：W: I haven't seen you here for a couple of weeks.
M: I've been spending a lot of time in the library.
W: Working on a paper？
M: I wish I were working on a paper. I was working on three different papers: anthropology, English literature and history.
W: Wow. That is a lot of work.
M: Yeah. And what's frustrating is that I'm studying the 19th century British Empire in all three classes. But I can't write a single paper for all the three.
W: Why not？
M: The professors won't let me even if I make it three times as long as the suggested length.
W: Oh. That's not too bad. Could you write your paper on three aspects of one topic？
M: Umm, what do you mean？ Do you have something in mind？
W: Well, let's see. Maybe you could do something with Romanticism, like: write your anthropology paper on a cultural basis of Romanticism; and your history paper on the influence of the Romantic poets on the British farm policy; and—OK—and your English paper on analysis of some Romantic poems.
M: Hey. That's not a bad idea. I've already started the research for one of my papers. So I can use that. What can I do to repay you？
W: You want wrap up my chemist lab for me？
M: I'd love to. But I've never taken chemistry. So I'm not sure you'd like the results.
W: Oh, well. No thanks necessary then. Have a good weekend. And try to get out of the library and get some sleep. You have big black circles into your eyes.
M: OK, I'll try. See you later.
What has the man been busy doing all week？

A. Writing papers for his classes.
B. Meeting with his professors.
C. Doing extra work in the chemistry lab.
D. Working overtime as a librarian.