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    Everyone should make a contribution to the environment. A. protect B. protected C. protecting D. protects 【查看更多】

     

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    Everyone should make a contribution to ________ the environment.

    [　　]

    A．protect

    B．protects

    C．protected

    D．protecting

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    Everyone should make a contribution         the environment.

    A．to protect

    B．to protecting

    C．protects

    D．protected

     

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