Don,t talk about such things you are not sure of?是AS还是THAT?为什么?

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Don,t talk about such things you are not sure of?是AS还是THAT?为什么?

Don,t talk about such things you are not sure of?是AS还是THAT?为什么?
Don,t talk about such things you are not sure of?
是AS还是THAT?为什么?

Don,t talk about such things you are not sure of?是AS还是THAT?为什么?
as 引导定语从句,此处不能用that,因为先行词前有such(这是规定)
定语从句关系词的选择要瞻前顾后:顾后,看在从句中做什么成分;瞻前,看先行词是否特殊或有没有被特殊词修饰.

as
such thing as 定语从句,as修饰thing 。固定用法、

such...that

that.

as
这是个定语从句,things被关系词替代充当of后面的宾语。因为前面有such修饰,关系代词应该用as。
如果of后面已经有宾语了则可能是个状语从句因为成分已经完整,那么就应该用that来引导这个结果状语从句
这里应该用as

as 吧

整体看来这是定语从句 you are not sure of这句话是修饰such things的,be sure of 是介词短语,在定语从句里such things 是介词of的宾语,只能用which。
as引导定语从句一般置于句首,如as is known to all,the earth is not the center of the universe。as指的是后面一整话