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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

試題分析：考查主謂一致。a quantity of+可數(shù)名詞復數(shù)時，謂語用復數(shù)；+不可數(shù)名詞時，謂語用單數(shù)；large quantities of大量的......，后加不可數(shù)名詞或可數(shù)名詞復數(shù)，謂語統(tǒng)一用復數(shù)形式，排除A、B、C，故選D。
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