题目内容

_________ the task , they have to stay there for another two weeks.
A．Not completingB．Not completed
C．Not having completedD．Having not completed
C

试题分析：考查现在分词的完成式做状语，因为他们是先没有完成任务，然后不得不在这儿再待两个星期。表示从句的动作先于主句的动作，要用现在分词的完成式，否定式是：not having done。选C。
点评：分词做状语的时候，如果动词与名词构成主动关系，就使用现在分词的形式；如果二者构成被动关系就使用过去分词的形式。如果从句的动作先于主句的动作，要用现在分词的完成式
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