we have never seengood a car this a,as as b,so as

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we have never seen__good a car __this a,as as b,so as
答案是第二个,但是我想知道a s ...as ..和什么一样,我知道she is as beatiful as her是可以的,但是可以说成she is as a beautiful girl as her吗

答案AB都是可以的.
表示比较时,as...as可用于肯定句/否定句,而so...as只用于否定句中.
至于as引导定语从句时,as...as和so...as是没有这种区别的,都可以.
但是必须说成：as/so + 形容词 + a/an + 可数名词单数,即as/so beautiful a girl as...
此处牵涉到as/so的词性,它们是程度副词“一样...”,对比so/such的区别：so beautiful a girl = such a beautiful girl,就知道为什么是这样的句序了.
so/as都是直接修饰形容词beautiful的,只是beautiful又修饰了名词girl,而不像such那样做形容词直接修饰名词.

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