Question

a quantity of后面跟单数还是复数?

Answer 1

an amount of +不可数名词，谓语动词用单数。

amounts of+不可数n谓语动词用复数追答：同样修饰不可数名词前者谓语动词用单数。

There is still an immense amount of work to be done.

还有非常非常多的工作没有做。

This smart washing machine will dispense an optimal amount of water for the load.

这台智能洗衣机会根据衣物多少适当安排进水量。

The server is designed to store huge amounts of data.

该服务器是为存储大量数据设计的。

Modern computers can organize large amounts of data very quickly.

现代计算机能迅速处理大量的信息资料。

Answer 2

a quantity of后面不能跟可数名词，只能跟不可数名词。