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    精英家教网 > 高中英语 > 题目详情
    The research is so designed that, once _______, nothing can be done to change it.
    A．beginsB．having begunC．begunD．Beginning
    D

    试题分析：该题主要考查省略句的用法。译文：这项研究就这样定下了，一旦开始就无法改变。
    句中once作“一旦……”讲，引导一个条件句，出于这个条件句的主语与主句的主语（the research）一致，所以省略掉了主语it和系动词is，只剩下一个过去分词begun，故最佳答案应选D。A项的错误在于缺少主语，B、D两项都是现在分词，不能用在条件句中作谓语，故可排除。
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