【题目】We all think it most foolish _______ this mistake． （ ）
A.for you making
B.of you to make
C.you to make
D.for you to make

【答案】B
【解析】it is adj of sb to do,这里的形容词是形容人的性格特征的,如nice,kind clever,foolish,smart,都是形容人的,it is adj for sb to do就是普通的形容词,如hard,impossible,important。句意：我们都认为你犯这样的错很愚蠢。故选B