think that you know what in fact you do not know is为什么用that和what

问题描述:

think that you know what in fact you do not know is为什么用that和what

用that是因为在think后面引导宾语从句,用what是因为know是及物动词后面必须有宾语,这里疑问词what可以做know的宾语,而that不行.