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    精英家教网 > 高中英语 > 题目详情
    12．A group of young Americans have come to Beijing for a visit．Half of them，___is，50persons，can speak Chinese fluently．（　　）
    A．thatB．whichC．whoD．it

    分析 一群年轻的美国人来北京参观．其中半数人，即50人，可以讲流利的中文．

    解答 答案：A．that is即是，就是说，为固定搭配，是对half of them的进一步解释说明，在句中做插入语成分，故选A．

    点评 本题考查插入语的用法，插入语在句中语法上是独立的，逗号隔开插入语与句子其他成分，可观察逗号及删去对句子表达有无影响来判断是否为插入语．

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