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    【题目】Much time _____ sitting at a desk, office workers are generally troubled by health problems.
    A.being spent
    B.having spent
    C.spent
    D.spending

    【答案】C
    【解析】句意：上班族们坐在办工座前太久，一般会受到健康问题的困扰。分析句子结构可知，分词的逻辑主语和后面主句的主语不一致，应用独立主格结构。分词主语和分词动作之间构成逻辑上的动宾关系，且动作已完成，故用过去分词。故选C项。

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