______ that he has wasted too much time, the boy is determined to stop playing video games.A.RealizedB.RealizingC.To realizeD.Having realized
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B解析考查非谓语动词。主语the boy与realize之间是主动关系，故排除A。这里分词作伴随状语，故C不正确；realize与be determined to几乎同时发生的动作，故不需要用现在分词的完成式。