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_________ 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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