It was clever__________at the answer in two minutes.

It was clever__________at the answer in two minutes.
A、of him to arrive
B、for him to arrive
C、for his arriving
D、of his arriving
【正确答案】：A
【题目解析】：考查固定句型。“It’S+形容词+of+名词/代词+to do sth#_#”为固定结构。0f前的形容词强调人的性格特征。