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    【题目】It’s bad for your eyes if you keep them ______ on the screen for a long time．

    A． fixed B． fix

    C． fixing D． having fixed

    【答案】A

    【解析】分析句子，可知空格内的词在句子中作宾语补足语，用于修饰宾语them;又由于them指代的是eyes，与fix之间是被动关系，故用过去分词。根据句意，可知选A。句意：如果你的眼睛一直长时间都专注在屏幕上，这对你的眼睛有害。

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