题目内容
6．There are three English-books on the shelf，but ______ of them is mine．（ ）| A． | both | B． | neither | C． | all | D． | none |
分析 在书架上有三本英语书，但是没有一本是我的．
解答 答案：D．选项A是两者都，用在肯定句；B是两者都不；C是三者或三者以上都；D是三者或三者以上都没有；根据There are three English-books on the shelf在书架上有三本英语书．but ______ of them is mine但是…表转折，说明没有一本是我的，所以应表否定，这里是三者或三者以上，所以用none．故选D．
点评 在做题时首先找出考点（不定代词），然后再掌握用法和区别（不定代词的区别）；再结合题干做出正确的选择．
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