Large quantities of polluted water into the sea so that lots of fish died.
A. is flowing
B. was flowing
C. are flowing
D. were flowing
网友回答
A. is flowing
B. was flowing
C. are flowing
(答案→)D. were flowing
解析： quantity作主语时,谓语动词要与quantity的单复数保持一致, 此处quantity为复数，再由后一句的时态可知答案为D。