问题补充：
Do you know ?
A. when will he be back
B. when he will be back
C. where did he go
D. where will he go
答案：
A. when will he be back
(答案→)B. when he will be back
C. where did he go
D. where will he go
解析：本题know后面跟的是一个宾语从句，要用正常的陈述顺序，故不选ACD,只能选B。
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