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    The FAO (Food and Agriculture Organization of the United Nations) has worked out that up to 30％ of food ________ lost in storage.

    [　　]

    A．are
    B．has
    C．is
    D．have
    答案：
    解析：

    百分数作主语，谓语依据其后的名词(food)确定。food为不可数名词，用单数谓语动词。


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