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    The trees must three times a week. A. water B. watering C. be watered 【查看更多】

     

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    The trees must _______ three times a week.
    [     ]
    A. water  
    B. is watering  
    C. be watered  
    D. waters

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    The trees must ________ three times a week.

    A. water

    B. is watering

    C. be watered

    D. waters

    查看答案和解析>>


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