A、He has broken his leg. B、He is ill and unable to talk. C、He has lost his job as a teaching assistant. D、He has arranged a clas

M: Math department, Doctor Webster speaking.
W: Hello, Prof. Webster, this is Janet Hill calling. I lived two doors down from your teaching assistant, Don Williams. Don asked me to call you because he has lost his voice and can’t talk to you himself.
M: Lost his voice? Oh, what a shame! Is there anything I can do for him?
W: Well, he has a class this afternoon from 2: 30 to 4:00 and he won’t be able to teach it. But he doesn’t want to cancel it, either.
M: Does he want me to try to find somebody else to teach the class?
W: No, not exactly. What he wants to do is to get someone to go in for him, just to pass back the midterm exams. He’s already marked them and they are on the desk in his office. The whole thing wouldn’t take more than ten minutes.
M: His class is at 2: 30, you say? Well, I’m free at that time and I was going to be on campus anyway; so I could do it for him. What room is his class in?
W: Cater Hall, Room two-fourteen.  Will you need his office key to get the exams7 He’s given it to me and I could bring it to you.
M: Actually, that won’t be necessary. We have a master key in the math department. So I can get into his office if necessary.
W: Thank you very much, Prof. Webster. Don doesn’t have another class to teach until Thursday, and hopefully, he will be able to talk by then. He’ll call you as soon as he can. Oh, yes, I almost forget.
M: Yes?
W: Could you put the next assignment on the board, too? It’s all the problems on Page 45,and they are due at the next class.
M: No trouble at all. Thank you for passing on all the news about Don, and please tell him not to worry about anything.