下列日常生活用语中，表示电话对话的句子是（） A: AHello, this is Li. May I speak to Chen, please? B: BHold on, please. C: CWould you hold the line, please? D: DWho's calling, please? E: EI'm sorry. I think you have the wrong number. F: FI'm sorry, but Chen is not available to come to the phone right now. May I take a message?