-I left my handbag on the train, but luckily someone gave it to a railway official.

-How unbelievable to get it back! I mean, someone________ it.[ ]

A．will have stolen  

B．might have stolen

C．should have stolen  

D．must have stolen

一般来讲，城市公共安全应急组织具有下列特征（）

A.组织正规化

B.结构紧凑化

C.体制军事化

D.结构模块化

E.职责多重化