第31题: [单项选择]Conversation OneA. He received a call from the delegation. B. He discussed with the Poland delegation. C. He knew it through the contract they signed. D. He received an E-mail this morning and knew it. 参考答案:D 答案解析:[解析] How did the man know that the delegation is made up of seven people [详解] 男士提到,今天早上他