分类：教育/科学-外语学习
问题：[英语]同义句Idon'tknow的同义句 
I don't know 的同义句
回答：I have no idea.
I'm not sure.
I haven't got a clue.
It's hard to say. (很难说）
Don't ask me! 　别问我！
It's not certain. (还不确定）