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    Every year millions of trees ▲ to prevent floods, droughts and sandstorms.A. plant B. are planted C. are planting D. were planted 【查看更多】

     

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    Every year millions of trees _____ to prevent floods, droughts and sandstorms.

    [     ]

    A. plant
    B. are planted
    C. are planting
    D. were planted

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    Every year millions of trees ________ to prevent floods, droughts and sandstorms．

    [　　]

    A．plant

    B．are planted

    C．are planting

    D．were planted

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