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【题目】________ the program, they have to stay there for another two weeks.

A. Not completing B. Not completed

C. Not having completed D. Having not completed

【答案】C

【解析】

试题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

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