She has already tried her beShe has already tried her best. Please don't be too ________ about her

job．[ ]

A. special  

B. responsible

C. unusual  

D. particularst

下列哪一项不属于系统软件( )

A．调试程序

B．计算机辅助设计程序

C．编译程序

D．数据库管理系统