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    — Why is the chemical plant closed?
    — Because large quantities of waste water ______ into the Yangtze River.

    A．has been released B．is being released
    C．was released D．have been released

    D

    解析试题分析：句意：--这个化工厂为什么被关闭了？--因为大量的废水被排放到长江里面。a quantity of+可数名词复数时，谓语用复数；+不可数名词时，谓语用单数；large quantities of大量的......，后加不可数名词或可数名词复数，谓语统一用复数形式，排除A、B、C，故选D。
    考点：考查主谓一致

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