Genghis Khan's Mongol empire was, at its peak, considerably larger than Attila's Hunnish empire, but because Attila's home base, in modern Hungary, much closer to Western Europe than Genghis' Mongolian headquarters, Genghis posing less of a threat to Rome.
                    
                
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                Amuch closer to Western Europe than Genghis' Mongolian headquarters, Genghis posing
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                Bmuch closer to Western Europe than to Genghis' Mongolian headquarters, Genghis posing
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                Cmuch closer to Western Europe than was Genghis' Mongolian headquarters, Genghis posed
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                Dwas much closer to Western Europe than was Genghis' Mongolian headquarters, Genghis posed
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                Ewas much closer to Western Europe than Genghis' Mongolian headquarters, Genghis posed
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        正确答案: D