— Is your brother afraid of the dark?— Yes. He always goes to sleep with the bedroom light

问题补充：

— Is your brother afraid of the dark?

— Yes. He always goes to sleep with the bedroom light .

A. off

B. in

C. at

D. on

答案：

A. off

B. in

C. at

(答案→)D. on

解析：off离开，切断；in在里面；at在一点；on在上面，开着的。句意：你的弟弟怕黑吗？——是的，他总是开着卧室的灯睡觉。故选D。