a great deal of ,a good many, a plenty of, a mumber of,a quantity of ,quantities of 的区别
最好有例子说明
参考答案:a great deal of 非常多的，大量的；跟不可数名词She has given me a great deal of help.
a good many很多的，相当多的；跟可数名词A good many workers were for the bill.
plenty of(没有a)充足的，相当多的；跟可数、不可数名词都可。We have plenty of time./We have plenty of books on the shelf.