Question

【题目】— It’s quite clever ___you____ out the difficult problem. — Thank you.

A. for; working B. for; to work C. of; working D. of; to work

Answer 1

【答案】D

【解析】

句意：——你解决了这个难题是非常聪明的。——谢谢你。根据句型It’s quite clever+of sb+to do sth“某人做某事是聪明的”，it是形式主语，to do sth是真正的主语。故选D。