题目内容

— 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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