把命题“等角的补角相等”改写成“如果…，那么…”的形式是：（    ）。

A project manager is called to an informal meeting with the customer and a problem is raised. This problem has major implications for the project manager’s company, but the customer wants to pursue a solution at the meeting. The project manager should（）.

A．tell the customer that he will not address any problems because this is only an information exchange meeting

B．tell the customer that the problem is not sufficiently defined to determine the appropriate action

C．collect as much information on the problem without committing his company to a solution

D．give the customer a range of solutions that might be acceptable to his company