听力原文:M: Math Department, Doctor Webster speaking. W: Hello, ProF.Webster, this is Janet Hill calling. 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 two thirty to four and he won't be able to teach it. M: Want me to try to find somebody else to teach the class? W: No. What he wants to do is to get someone to go in for him, just to pass back the mid-term exams. He's already marked them and they are on the desk in his officE. M: Well, I'm afraid I could do it for him. What room is his class in? W: Cader Hall, Room Two-fourteen. Will you need his office key to get the exams? He's given it to me and I could bring it to you. M: No, thanks. We have a master key in the maths department. 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. M: OK. W: Oh, yes, I almost forgot. Could you pat the next assignment on the hoard, too? It's all the problems on Page Forty-five, and they are due at the next class. M: I seE. (20) A.He can't find his office key. B.He has misplaced some exams. C.He is unable to talk. D.He doesn't like his classroom.
A.W: B. M: C. M: D. M: E. M: F. W: G. M: H. W: I. M: J. (20) A.He K. B.He L. C.He M. D.He
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C 解析:According to the conversation, what is Dan's problem?