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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 對調查案件的警察來說，他們最關注的是謀殺案發生時，她在什么地方．

解答 答案：D   題干所給的句子中，前面的she was at the time of the murder 是主謂結構；后面接了was of major concern to the police that are investigating the case系表結構，說明前面的部分是充當了was的主語，是一個主語從句；警察查案關注的是時間和地點，而時間"案發時"句中已經出現，地點where；why，whether無法和she was構成有意義的句子．故選D．

點評 在句子中起名詞作用的各種從句統稱為名詞性從句．根據它們在句中的語法作用，這類從句又可分為主語從句、同位語從句、表語從句和賓語從句． 本題中where在主語從句中起連接作用，同時又充當了從句的表語．

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