a large quantity of 和large quantities of的用法区别?
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答：该问题主要涉及的知识点为：quantity 与后面谓语动词单、复数搭配(即主谓一致)。但是关于quantity 与谓语单复数搭配，现在说法不统一。主要有两种观点：
1、与词形保持一致
a quantity of /quantities of 不管后面接复数还是单数(包括不可数)名词，只看quantity 本身。即：a quantity of 中的quantity 是单数，谓语动词就用单数；quantities of 中quantities 是复数，谓语动词则与复数保持一致。例如：
Quantities of nuts were on the table.
A quantity of nuts was on the table.
2、与意义保持一致
There is only a small quantity of wine left.
Great quantities of sand was washed down the hillside by the rain last night.
A large quantity of air conditions have been sold since the summer came.
Huge quantities of oil were shipped to Japan last year.
结论：目前，比较倾向于与quantity 的词形保持一致，即 a quantity of 是单数，quantities of 是复数，而不管后面接单数或复数的名词。例如，某省一道高考题如下：
With many forests being destroyed, huge quantities of good earth ______ each year.
A. is washing away B. is being washed away
它所给的答案是D. 此题中，earth 是不可数名词，但quantities 是复数，所以谓语采用了复数形式D.
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