The price system is a plex network posed of the prices of all the products bought and sold in the economy as well as of a great number of servicesA.the oneB.thatC.onesD.those
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D解析考查代词的用法：A. the one 特指前面的可数名词单数，B. that特指前面的可数名词或不可数名词，后面有后置定语，C. ones泛指可数名词复数，D. those 特指可数名词复数，后面有后置定语，句意是：价格系统是复杂的由所有产品在经济中的买卖价格以及那些大量的服务的价格组成的网状系统。选D。