Nothing is so easy asparents raise their expectations of their children too high.A. ofB. t

问题补充：

Nothing is so easy asparents raise their expectations of their children too high.

A. of

B. to

C. by

D. for

答案：

A. of

B. to

C. by

D. for

解析：句意为：没有什么比父母亲过多的提高对孩子的期望值更容易的了。for parents“对于父母亲来说”，不定式是真正的被比较成分。本句的关键是找到关键点，一方面的nothing is so…as结构，另一方面就是不定式的成分界定。