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 雖然解釋了幾十遍，但Derek還是不能理解過去分詞如何在具體情景中使用．

解答 答案：D
題干中but是表示轉(zhuǎn)折關系的并列連詞，說明前面也是一個簡單句；though不能和but連用．故選D．

點評 并列連詞用來連接并列句．常用的并列連詞有：表并列關系的and，neither…nor．，either…or…，as well as，not only…but also…；表轉(zhuǎn)折關系的but，yet，however，still，while；表選擇關系的either…or…，neither…nor…，or，otherwise；表因果關系的for，therefore，so，學習時要加以區(qū)分和掌握．

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