宾语从句中what which that怎么区分

that---引导陈述句作宾语从句，无词意，可省略。
what和which都引导特殊疑问句做宾语从句。
what什么----没有一定范围
which那个（些）----有一定范围

What book do you like best?你最喜欢什么类书籍？
Which book do you like best of the three books?三本书中你最喜欢哪一本？

宾语从句中that和which可以交替使用，至于what，相当于all that 当主句和从句都缺少一个成分时用what，如
what we must do is to clean the room.

that引导陈述性的宾语从句
which 和what 引导的特殊疑问句作宾语