—Look! The man at the gate              be our headmaster. He is always standing there every morning.

—No, it              be him, He is having a meeting in the office now. [ ]

A. must, can't

B. must, mustn't

C. can, can't

在Win2000的恢复控制台中，可以完成的任务有（）。

A.启动和停止服务

B.在本地驱动器上读取和写入数据

C.格式化磁盘

D.创建新用户