个人觉得应该是Aas

　　好像定语从句里面有提及到as的用法的

　　定语从句中若先行词前有thesame,such作修饰语,通常用as作关系代词.

　　Heusedsuchexpressionsashecouldfindinthetexts.

　　Theystayedforthenightinthesameroomastheyhadoncerented.

　　such…as和such..that

　　such…as定语从句,as在从句中可以作主语,宾语,表语；such…that引导结果状语从句,that不充当任何成分,只起到连接作用,如：

　　Theytalkedinsuchsimplelanguageaschildrencouldunderstand.

　　Theytalkedinsuchsimplelanguagethatchildrencouldunderstandit.

　　如果前面是don'treadthebooks----youcan'tunderstand.

　　就应该是that和which都可以