as great as it is 的用法如何理解

Finally, with dissatisfaction with conventional education  as great as it is in some circles in England and certainly in the USA, the question might even arise in the parents minds as to whether the child should be compelled to go to school at all.

老师,这里的as great as it is怎么理解,为什么as great as 能提前,it指代的又是什么,后面那个as to是关于的意思么,as to引导的部分是question的同位语么?

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曹荣禄  
擅长:动词用法,句法问题

as great as it is in some circles in England and certainly in the USA 为形容词短语,是with复合结构中的宾补。greatas...as...比较结构修饰。it指代dissatisfaction with conventional educationit is的表语为比较对应项必须省略。所以这里并不存在great提前的问题。as to为复合介词,后接whether从句构成介词短语,介词短语为分隔式定语,修饰the question。介词短语不能作同位语,只能是定语。

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