a quantity of 谓语

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a quantity of+可数名词复数、谓语动词用复数;+不可数名词、谓语动词用单数.即修饰可数或不可数名词均可,作主语时采取就近一致的原则,其谓语动词通常与短语中of后面的名词的数保持一致.

(1)a quantity of+可数名词复数，作主语，谓语用复数

(2)a quantity of+不可数名词单数，作主语，谓语用单数

A large quantity of beer was consumed.Quantities of food were on the table.

A:a large quantity of+不可数名词，作主语，谓语用单数

船里有大量的鱼肉。

There is a large quantity of fish in the boat.