He didn't want to see anybody, so he spent six hours ________ in the small room.

A．locked

B．to lock

C．locking

D．being locked

圆弧插补指令命令刀具在指定平面内按给定的（）作圆弧插补运动。

A.进给量

B.位移

C.进给速度

D.位置