I went to the summer palace last month 变特殊疑问句

问题描述:

I went to the summer palace last month 变特殊疑问句
___ ___ did you ___ ___ last month?

when did you go to the Summer Palace?
why did you go to the Summer Palace last month?
Where did you go last month?
如果是这样的话,我想到的只有which place did you go to last month?