问题补充：
Everyone should the environment.
A. make a contribution to protect
B. make contribution to protecting
C. contribute in protecting
D. make contributions to protecting
答案：
A. make a contribution to protect
B. make contribution to protecting
C. contribute in protecting
(答案→)D. make contributions to protecting
解析：考查固定词组。固定词组make contribution/a contribution to…对…做出贡献；contribute to…对…做出贡献；句意：每个人都应该为环境保护做出贡献。故D正确。
