— Could you tell me ______ the Science Museum?

— Next Saturday.

A．when will we visit

B．when did we visit

C．when we visited

D．when we will visit

公共关系管理过程的四个步骤，即四步工作法，包含（）和公关策划、公关实施、公关评估。

A.公关调查

B.随即抽样

C.目标作业

D.公关管理