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1.Not having worked out the problem,_________leave the office.(  )
A.so he was not allowed toB.and he didn't want to
C.the teacher couldn't make himD.he couldn't free himself to

分析 没有把问题解决,他不能随便离开办公室.

解答 答案:D句中有逗号分隔,前面是现在分词作原因状语,不是句子,因此后面不能用连词,可排除AB;现在分词短语having worked out与主语要构成主谓关系,从句意可以看出解决问题的不是老师,而是he,故选D.

点评 现在分词是非谓语动词的一种,表达主动或进行;过去分词表达被动或完成;动词不定式表达未发生的动作.学习时,要注意区分和掌握.

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