Quantities of water ________for cooling in the only one of the factories that ________steel.A.has been needed；producesB.have been needed；produceC.is needed；produceD.are needed；produces
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D解析考查主谓一致，Quantities of+名词（可数或不可数）做主语时，谓语动词用复数，所以第一空应用复数形式，可排除A和C，第二空，one前面有the only修饰，故从句的动词应用单数，所以选D。