—Where are you going for your holiday?   —Well, we ______ yet. [ ]

A. haven't decided

B. hadn't decided

C. don't decide

D. didn't decide

工作负责人、工作许可人任何一方不得擅自变更（），值班人员不得变更有关检修设备的运行（）。工作中如有特殊情况需要变更时，应事先取得对方的同意。