She was working in the room suddenly she heard a boy crying and ____ out as quickly as she could to see what was happening.

A．went

B．going

C．go

D．had gone

一个双面5英寸软盘，每面40道，每道8个扇区，每个扇区512个字节，则盘片总容量为（1）。若该盘驱动器转速为600转/分，则平均等待时间为（2），最大数据传输率为（3）。

空白（2）处应选择（）

A.25ms

B.50ms

C.100ms

D.200ms