标题: 求助 [打印本页] 作者: zzzxvvvvvv 时间: 2012-3-7 19:34 标题: 求助 OG 83题 In 2000, a mere two dozen products accounted for half the increase in spending on prescription drugs, a phenomenon that is explained not just by the fact that drugs are becoming more expensive but also by the fact that doctors are writing many more prescriptions for higher-cost drugs. 这里a phenomenon... 整个句子是什么成分啊？想不通啊