— Did he notice you enter the room?

— I don’t think so. He＿＿to the radio with his eyes shut.

A．listened

B．was listening

C．has listened

D．had listened

所有在函数中定义的变量及函数的形式参数，都属于

A．全局变量

B．局部变量

C．静态变量

D．常量