单选题：由采购人直接选定一家咨询单位，通过谈判达成协议，为其提供工程咨询服务的招标方式，称为（　　）。

题目内容：

由采购人直接选定一家咨询单位，通过谈判达成协议，为其提供工程咨询服务的招标方式，称为（　　）。 A．公开招标
B．邀请招标
C．直接委托
D．框架合同

参考答案：

答案解析：

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