填空题 When we watch a world-class musician or a top athlete, we don’t see the years of preparation that _____ him or her to become great. (able)无
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【正确答案】 1、enabled    
【答案解析】根据句型可知设空处缺少谓语动词, able的动词形式为enable, 根据句意推断可知需用过去时。