—Do you know ?
—Yes. At about twelve. I was just about to go to bed.
A. when he came back
B. when he will e back
C. when did you go to bed
D. whether he goes to bed late
网友回答
(答案→)A. when he came back
B. when he will e back
C. when did you go to bed
D. whether he goes to bed late
解析：考查宾语从句。从句为特殊疑问句，常选择what,when,where,which,who,how等的疑问代、副词作连接词时，语序要用陈述语序。根据答语是一般过去时，另根据后句句意为“是的。大约在十二点。我刚要睡觉。”故选A。