Tom wants to know.　- I dont know, either. He said he would phone me as soon as he

--- Tom wants to know .
　 --- I don't know, either. He said he would phone me as soon as he came back.
A. when Dad comes back
B. when did Dad come back
C. when Dad will come back
D. when does Dad come back

A. when Dad comes backB. when did Dad come back(答案→)C. when Dad will come backD. when does Dad come back解析：英语宾语从句中一般为陈述语序。根据下文，我也不知道。他说他一回来就给我打电话。可知上文宾语从句中描述的是将来某时发生的动作，故用一般将来时态，选C。

感谢回答，我学习了