____ the problem was ______ he could deal with, he called the police for help.A.To realize; whatB.Having realizing; more thanC.Realized; more thanD.Having been realized; what
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B解析意识到问题超出他所能处理的范围，他打电话向警察寻求帮助。more than超过；realize这一动作发生在主句谓语call之前，所以用realize的完成时，且realize和主语he是主谓关系，所以选B。