You are sure to know the result, but that's_______everybody has finished their work. [ ]

A. when      

B. why      

C. before      

D. until

人防工程不应或不得设置（）。

A.柴油发电机房

B.油浸电力变压器室

C.医院病房

D.甲类的生产车间

E.乙类的生产车间