徵求高手牛牛 (from莫力語法難題#96)

Kath1985

#96修詞寶典 (from 台灣莫力)
The books W.E.B.Dubois before World War 1 constituted as fundamental a challenge to the accepted ideas of race relations that, two generations later, will be true of the writings of the radical writers of the 1960's
A  that, two generations later, will be true of
B  that, two generations later, would be true of
C  as, two generations later, would be true of
D  as, two generations later, would
E  just in the way that, two generations later, did

答案C  
句意為 W在第一次世界大戰得著作對公認種族關係的構想構成了重要挑戰，正如1960年代,也就是兩個世代，激進派的作家作品也是如此
我的問題如下,懇請好心大牛解惑
1.為何 as + fundamental + a + challenge 而非 as + a + fundamental
challenge ?
2.答案C的解釋說第一個as是副詞 第二個as是關係代名詞當主詞
不明白這個解釋
3. as ….. as would be true of 第二個as是省略了 a challenge嗎?

Kath1985

還是困惑中