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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

試題分析:考查現(xiàn)在分詞的完成式做狀語,因為他們是先沒有完成任務,然后不得不在這兒再待兩個星期。表示從句的動作先于主句的動作,要用現(xiàn)在分詞的完成式,否定式是:not having done。選C。
點評:分詞做狀語的時候,如果動詞與名詞構成主動關系,就使用現(xiàn)在分詞的形式;如果二者構成被動關系就使用過去分詞的形式。如果從句的動作先于主句的動作,要用現(xiàn)在分詞的完成式
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