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Discovery in a South African cave sugges...

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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