a quantity of +可数名词复数,谓语动词用单数还是复数?

问题描述:

a quantity of +可数名词复数,谓语动词用单数还是复数?

the quantity of 表示....的量,一般用单数。
the quantity of a crop that is harvested
a quantity of 表示一些,一般接不可数名词,谓用单数
A vast quantity of foodstuffs was shipped to Africa.

复数

单数,quantities of才加复数