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    【题目】The young trees ______ every three days.
    A.are watered
    B.were watered
    C.are watering
    D.have watered

    【答案】A
    【解析】句意：这些小树每三天被浇一次水。主语trees与water之间构成动宾关系；every three days可知时态为一般现在时。故选A。

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