It is careless such a mistake.
A. of you to make
B. of your making
C. for you to make
D. for your making
网友回答
(答案→)A. of you to make
B. of your making
C. for you to make
D. for your making
解析：考查固定结构。因为careless是一个表示主语性格特质的形容词，所以使用of；本句=You are careless to make such a mistake.