I always believe that the world is___you think it is,so smile at the world and It'll be back空格填————Awhat Bthat 哪个为什么?

问题描述:

I always believe that the world is___you think it is,
so smile at the world and It'll be back
空格填————Awhat Bthat 哪个为什么?

what
the world is 后面是宾语从句,从句中又缺少宾语
用that 的话,它的从句中不能缺少成分

what
what引导表语从句,在标语从句中做表语

A
what 可以做宾语,而这个句子中正好少宾语.
that修饰名词,做定语从句.