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

 

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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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Everyone should make a contribution to ________ the environment.

[　　]

A．protect

B．protects

C．protected

D．protecting

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