All of following should be done by the project manager during project control EXCEPT ______.

A) determine that a change has occurred
B) ensure that a change is agreed
C) make sure all changes are approved by management
D) manage changes as they occur

商务谈判开局阶段的主要任务是（）。

A.制定本方要达到的目标

B.收集对手的情报

C.营造谈判的气氛

D.判断对方垰的目标