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    Discovery in a South African cave suggests that modern human behavior ____ much earlierthan ____.

    A. begin, previously thoughtB. began, previously thought

    C. should begin, previous thinkingD. began, previous thinking

     

    B

    【解析】

    试题分析：考查时态及非谓语动词。句中的动词suggest为“表明”之意，故从句用真实语气，根据时态用一般过去时；逻辑主语modern human behavior与think为被动关系，故用过去分词，分词前只能用副词修饰。句意：在南非一个岩洞发现表明，现代人类行为的开始要比先前认为的要早的多。故B正确。

    考点：考查时态及非谓语动词

     

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