It is said that to classic music may be helpful in improving teenagers’ taste. A. exposed

问题补充：

It is said that to classic music may be helpful in improving teenagers’ taste.

A. exposed

B. exposing

C. being exposed

D. having exposed

答案：

A. exposed

B. exposing

(答案→)C. being exposed

D. having exposed

解析：考查非谓语动词。exposing to classic music may be helpful in improving teenagers’ taste动名词短语作主语，句中it为形式主语，故选C。