a number of VS a quantity of 懂的请进

问题描述:

a number of VS a quantity of 懂的请进
分别什么时候用 怎么用 再帮我解答 as a result of destroying the forests, a large()of desert()covered the land. 第一空 :number or quantity 第二 空: have or has

desert是不可数名词 只能用a large quantity of 来修饰,谓语动词用单数