-Do you know _________?-Yes．At about twelve．I was just about to go to bed．A.when he came backB.when he will e backC.when did you go to bedD.whether he goes to bed late
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A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。