_________ the task , they have to stay there for another two weeks.A．Not complet
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_________ the task , they have to stay there for another two weeks.| A．Not completing | B．Not completed | | C．Not having completed | D．Having not completed |
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答案
| C |
解析
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 |
举一反三
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from the top of the tower, you can get a better view of the city.| A．Seen | B．To see | C．Seeing | D．Being seen |
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