问题
选择题
— 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
答案
答案：D
题目分析：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。