题目内容

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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