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    We all should make a contribution to ______ our environment.

    A. protects B. to protect

    C. protecting D. protect

     

    C

    【解析】

    试题分析：句意:我们都应该为保护环境做贡献。protect 保护，是一个动词。这句话中使用了短语make a contribution to ，对…做贡献，短语中to 是一个介词，因此后面跟名词或动名词的形式。故选C。

    考点：考查动名词作宾语。

     

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