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根据倒数第三段"But simplifying the financial-aid system,making it more flexible and building in better motives for student performance could make it much more effective"可知,让金融援助系统变得简单和灵活,将会对学生产生积极的影响故填simple.79.must/necessity必要.细节理解题.根据倒数第二段"as is ...