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    19．________ she was at the time of the murder was of major concern to the police that are investigating the case．（　　）
    A．WhenB．WhyC．WhetherD．Where

    分析 对调查案件的警察来说，他们最关注的是谋杀案发生时，她在什么地方．

    解答 答案：D   题干所给的句子中，前面的she was at the time of the murder 是主谓结构；后面接了was of major concern to the police that are investigating the case系表结构，说明前面的部分是充当了was的主语，是一个主语从句；警察查案关注的是时间和地点，而时间"案发时"句中已经出现，地点where；why，whether无法和she was构成有意义的句子．故选D．

    点评 在句子中起名词作用的各种从句统称为名词性从句．根据它们在句中的语法作用，这类从句又可分为主语从句、同位语从句、表语从句和宾语从句． 本题中where在主语从句中起连接作用，同时又充当了从句的表语．

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