题目内容
3．They were all very tired，but _______ of them took a rest．（ ）| A． | none | B． | all | C． | both | D． | either |
分析 他们都很累，但是没有一个休息．
解答 答案：A 根据they were all…与but，可知是将all全部否定，应用none．all表示全部都；both两者都；either或者这个或者那个．故选A．
点评 本题考查不定代词．要根据but判断出全部否定，是做题的关键．
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