In some countries _____are called 'public schools' are not o

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In some countries _____are called 'public schools' are not owned by the public.
A.which B.as C.what D.that
选C
为什么不选其余三项,

因为句是主语从句,what 既可以引导主语从句,并且又可以在从句中作成分,what在本句的主语从句中作主语.而which, as, that 引导的是定语从句,并且前面必须有先行词,而what前面不用先行词,即先行词+ that / which = what

希望能帮到你,祝更上一层楼O(∩_∩)O
有不明白的请继续追问(*^__^*)
再问：什么是“先行词”老师能举个例子吗？
再答：先行词是定语从句中被修饰的名词，如 This is a book that he gave me. 这是他送给我的书。这句中的book就是先行词。你上面的句子，其实也可以加上一个先行词，然后用that或which 引导，变成定语从句，即 In some countries the schools that are called 'public schools' are not owned by the public.

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