I hear they've promoted Tom, but he didn't mention _____ when we talked on the phone. [ ]

A. to promote

B. having been promoted

C. having promoted

D. to be promoted

房地产估价的合法原则要求在进行房地产估价作业时应以（）为前提来进行工作。

A．公正

B．公平

C．公开

D．估价对象的合法权益