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    9．Trees fight air pollution．They are natural air conditioners． A．should B．must C．need D．can 【查看更多】

     

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    Trees ____ fight air pollution．They are natural air conditioners．

           A．should    B．must    C．need   D．can

     

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    Trees ____ fight air pollution．They are natural air conditioners．

           A．should    B．must    C．need   D．can

     

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    Trees ____ fight air pollution．They are natural air conditioners．

           A．should    B．must    C．need   D．can

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    Trees ____ fight air pollution．They are natural air conditioners．

    A．should                 B．must             C．need              D．can

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