题目内容

20．Not having completed（not complete） the program，they have to stay there for another two weeks．

分析 没有完成这个项目，他们只好在那里再呆两个星期．

解答 答案是Not having completed．本题考查分词做状语；逗号后面是完整的句子，句中不存在并列连词或引导从句的引导词，所以判断not complete必须要非谓语的形式；本题中需要的是分词做状语；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；题干中not complete和主语they之间是主动关系，所以用现在分词；此外分词完成式表示分词的动作在谓语动词之前已经发生或完成，相当于after引导的时间状语从句；本句中指没有完成项目之后，才不得不再待两个星期；所以用现在分词完成式；非谓语动词的否定式在非谓语前直接加not；故答案用Not having completed．

点评 本题是要求用所给动词的适当形式填空，解题时首先考虑句中需要的是谓语动词还是非谓语动词；其次，如果是谓语动词关注时态、语态和数的变化；如果是非谓语动词要联系非谓语的基本用法判断非谓语的形式．

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