题目内容
12．Henry was happy because ________ of his three sons came back home on Father's Day．（ ）| A． | both | B． | all | C． | either | D． | neither |
分析 亨利很高兴因为在父亲节这一天他的三个儿子都回来了．
解答 答案：B．
首先明确选项中每个不定代词的意思，A：两者都；B：三者或三者以上都；C：两者中的任何一个；D：两个都不； 结合选项联系语境可以推断设空处句子的句意是"亨利很高兴因为在父亲节这一天他的三个儿子都回来了．"，所以不定代词all 在本句中符合句意，故选B．
点评 不定代词指不是指明代替任何特定名词的代词．常见的不定代词有a11，both，each，every等，以及含有some-，any-，no-等的合成代词，如anybody，something，none．这些不定代词大都可以代替名词和形容词，在句中作主语、宾语、表语和定语．
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