it can be added.For example,I have no idea that my mom was actually a movie star! 是可以加上的,比如说:我从来就不知道我妈妈原来是一个大明星! 不是我找的答案,是自己的答案. 如果你觉得不对那你就上google打I have no idea that,然后你看会出现什么,如果这就话被用那你就可以放心的加THAT了~
当然可以!! i have no idea that she left so early! i have no idea that you were a liar! i have no idea that you did not get any money from her! i have no idea that you did not like her!