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    It is said that sixty percent of all energy ________ in the world today is being lost as wasted heat.
    A．producedB．producing
    C．to produceD．having produced
    A
    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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