It’s clever her to work out many difficult math problems.A. for; soB. of; suchC. of; so

问题补充：

It’s clever her to work out many difficult math problems.

A. for; so

B. of; such

C. of; so

D. for; such

答案：

A. for; so

B. of; such

(答案→)C. of; so

D. for; such

解析：句意:她做出了这么多数学难题她真是太聪明了。本题考查的句型是it is +adj.+ of/for sb. to do sth. 对某人来说做某事是…的。在这个句子中所用的形容词是clever，故这个句型中的介词用of。如此多，用many 表示数量，应用so 来修饰，故选C。