Large quantities of polluted water_____ into the sea so that lots of fish died.
A．is flowingB．was flowingC．a(chǎn)re flowingD．were flowing
D
quantity作主語時(shí),謂語動(dòng)詞要與quantity的單復(fù)數(shù)保持一致, 此處quantity為復(fù)數(shù)，再由后一句的時(shí)態(tài)可知答案為D。
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