Do your homework （A.as carefully as possible）.要尽可能认真地做你的作业.因为carefully在这里修饰的是动词do,所以是用副词形式.形容词careful用于修饰名词.as...as possible,尽可能地…….而so...as是用于否定...能用so……as造个句子吗？She isn't so tall as her sister. （她没有姐姐那么高。）Jack doesn't run so quickly as Tom. （杰克跑得没汤姆那么快。）