问题补充：
—Tom, your father went to Hong Kong last week. Do you know ?
— Next month.
A. when will he come back
B. when he will come back
C. where will he come back
D. where he will come back
答案：
A. when will he come back
(答案→)B. when he will come back
C. where will he come back
D. where he will come back
解析：特殊疑问句作宾语从句，要用陈述句语序。故选B
