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13.The project was so designed that once _______,nothing can be done to change it.(  )
A.beginsB.having begunC.beginningD.begun

分析 这个项目如此设计,一旦开始,什么也没有办法改变它.

解答 答案是D.本题考查"连词+分词"的结构."连词+分词"的结构在句中往往做状语,属于分词做状语;分词做状语时分词的选择是看分词和句子主语之间的关系:分词和句子主语之间是主谓关系(主动关系),用现在分词;分词和句子主语之间是动宾关系(被动关系),用过去分词;本题中连词once后的begin和句子主语the project之间是被动关系,所以答案选择D.

点评 首先判断选项中的动词在句中是以谓语还是非谓语形式出现,然后根据选项在句中的功能结合非谓语的基本用法做出合理的判断.要关注常见非谓语动词的搭配.

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