Senior high school student as he is he finds it a difficult timeas a grown-up by his pare

问题补充：

Senior high school student as he is, he finds it a difficult timeas a grown-up by his parents.

A. treating

B. to be treated

C. being treated

D. to treat

答案：

A. treating

(答案→)B. to be treated

C. being treated

D. to treat

解析：考查不定式：句意：虽然他是高中生，他发现被父母当成年人一样对待。使用的是find it+名词+to do sth，这里的不定式是做宾语的，it是形式宾语，而且他是被对待，用不定式的被动式，选B。