Everyone should make a contribution the environment.A. to protectB. to protectingC. protec

问题补充：

Everyone should make a contribution the environment.

A. to protect

B. to protecting

C. protects

D. protected

答案：

A. to protect

(答案→)B. to protecting

C. protects

D. protected

解析：考查非谓语动词.句意:每个人应该为保护环境做出一份贡献.make a contribution to doing sth表示全力一赴做某事,to是介词后面接名词或者动名词作宾语,动名词表示抽象动作,故选B.。