计算机软件分系统软件和应用软件两大类，其中处于系统软件核心地位的是

A．数据库管理系统

B．操作系统

C．程序语言系统

D．网络通信软件

When the headmaster spoke out his plan, the _____of the students in the class ____ against it.

A．majority; were

B．most; were

C．most; did

D．majority; did