决策的类型如按其重要性划分可分为( )

A．战略决策、战术决策
B．程序化决策、非程序化决策
C．确定型决策、不确定型决策
D．个人决策、团体决策
E．以上均是

She worked deep into the night _____ a long speech for the president. [ ]

A. to prepare

B. preparing

C. prepared

D. being prepared