题目内容：

large quantities of water___?
have been polluted 还是has been pulluted?

优质解答

have been pollutedhave 是跟着 quantities这个复数名词走而不是water 参见：CoalLarge quantities of water are frequently needed to remove impurities from coal at the mine.

追问：

如果是quantity 是否就用单数？不用管后面的名词吗？

追答：

是的，参见： A large quantity of air-conditioners has been sold since the temperature is high.