in western countries,____are thrown away each day.a.mountain
in western countries,____are thrown away each day.a.mountains of rubbish b.mountains of rubbishes c.a lot of rubbish d.a lot of rubbishes.我知道rubbish是不可数名词,a lot of既可以修饰可数名词,也可以修饰不可数名词阿.是不是因为后面的系动词是are的缘故?