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    It is said that sixty percent of all energy ________ in the world today is being lost as wasted heat.

    A．produced B．producing

    C．to produce D．having produced

     

    A

    【解析】A 考察非谓语动词。据说现在世界上生成的所有能源的百分之60都是以废热的形式浪费掉了，produce和句子谓语is之间满意连词，故使用非谓语形式。Produce和逻辑主语energy之间逻辑上构成被动关系。用过去分词做后置定语。故A正确。

     

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