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17._____ scores of times,but Derek still couldn't understand how to use past participle in a concrete situation.(  )
A.Having explainedB.Having been explained
C.Though it was explainedD.It was explained

分析 虽然解释了几十遍,但Derek还是不能理解过去分词如何在具体情景中使用.

解答 答案:D
题干中but是表示转折关系的并列连词,说明前面也是一个简单句;though不能和but连用.故选D.

点评 并列连词用来连接并列句.常用的并列连词有:表并列关系的and,neither…nor.,either…or…,as well as,not only…but also…;表转折关系的but,yet,however,still,while;表选择关系的either…or…,neither…nor…,or,otherwise;表因果关系的for,therefore,so,学习时要加以区分和掌握.

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