题目内容

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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