— You _______ your drama play very much. I saw you preparing for it excitedly. 　　

— Not really, because of the exam. 　

  [ ]

A. must enjoy　　　

B. must have enjoyed

C. can enjoy 　　　　　　

D. should enjoy

当用遥控器对电视机遥控关机时，此时电视机内的（）

A．中放通道仍在工作

B．高频头和遥控接收部分仍在工作

C．遥控器和开关电源仍在工作

D．遥控接收器仍带电工作