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— Why is the chemical plant closed?
— Because large quantities of waste water ______ into the Yangtze River.
A.has been releasedB.is being releasedC.was releasedD.have been released
D

试题分析:考查主谓一致。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。
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