It's quite clever ___ you ___ out the problem.

问题描述:

It's quite clever ___ you ___ out the problem.
A.for; working
B.for; to work
C.of; working
D.of; to work

D.句型it's adj +for/of sb to do sth
如果这个形容词可以修饰人,就用of,如果不能用来修饰人,就用for,句中clever可以修饰人,所以用of