–Do you know?–Yes. At about twelve. I was just about to go to bed. A. when he came backB.

发布时间：2020-08-16 22:25:11

–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. whether he goes to bed late

网友回答

解析：考察时态和语序。根据下文的I was just about to go to bed.可知是过去时，排除BC。
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