分析：
本句中In some countries只是个地点状语,也可置于句后,即写成：
____ is called “equality” does not really mean equal rights for all people In some countries.
按照你的问题,可以推测你似乎对英语的句子结构不够理解.
英语中每个句子的基本结构为：主语+谓语+宾语
本句中的主语为：____ is called “equality”
谓语为：does not mean
宾语为：equal rights
地点状语为：In some countries
而for all people只是对rights的修饰和说明,说明其是人的权利,而非其它事物的权利.
上面句子一看就知道句子缺少主语,所以此处要填what ,而不是你想的非限制性定语从句
非限定性定语从句的作用是对所修饰的成分作进一步说明,通常和主句间用逗号隔开,将从句拿掉后其他部分仍可成立
如：The astronaut did many experiments in the spaceship,______ much
help for knowing space.
A which we think it is B which we think are of
C of which we think is D I think which is of
选 B
这里which是对前面整个句子的补充说明,强调其中的某些实验有助于人们了解太空,去掉后面的______ much help for knowing space. 主句任然成立,即句子The astronaut did many experiments in the spaceship 中不缺少任何成分. 所以该处的which为非限制性定语从句
