scores of times.but Derek still couldn't understand how to use past participle in a concrete situation．( )A．Having explainedB．Having been explainedC．Though it was explainedD．It was explained 题目和参考答案——青夏教育精英家教网——

题目内容

17．_____ scores of times，but Derek still couldn't understand how to use past participle in a concrete situation．（　　）

	A．	Having explained		B．	Having been explained
	C．	Though it was explained		D．	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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D．SHELTERBOX．ORG．