They have no idea at all .
A. where he has gone
B. where did he go
C. which place he has gone
D. where has he gone
网友回答
(答案→)A. where he has gone
B. where did he go
C. which place he has gone
D. where has he gone
解析：第一个原因与第4题一样；至于疑问词的选择，因为go是一个不及物动词，如果要表示“去哪里”，就要用“go+副词”或“go+介词+名词/代词”结构，因此如果选C的话，gone后应加介词to。故使用连接词where。