【正确答案】 B

【答案解析】 [听力原文]
   W: Good morning. What can I do for you?
   M: This is John Smith from ABC company. Can I speak to Mr. Jones, please?
   W: I'm sorry. Mr. Jones is now in a morning meeting.
   M: Can you help me take a message for him?
   W: Sure.
   M: Please tell Mr. Jones that I've caught a fever. So I can't come to our business meeting this afternoon.
   W: I'm sorry to hear that. Please take care.
   M: Thank you. And I want to know if it is okay to have the meeting at the same time next Monday?
   W: I will give Mr. Jones the message as soon as he is available.
   M: Thanks.
   Why can't Mr. Jones answer the phone?
原因题
   题干问为什么琼斯先生不能接电话。根据对话内容可知，琼斯先生现在正在开早会。故选B。