一个很迷惑的英语单选题

一.a great many 与 a great many of 的区别
A：a great many + 复数可数名词
B：a great many of + 限定词+复数可数名词
(注意：限定词与修饰词是不同的。如果没有弄清这点，可能就会举出这样的例子：a great many of good students （wrong)

用法举例如下：
a great many students
a great many good students
a great many of the students
a great many of these apples
a great many of my students
a great many of Tom's classmates

二. a great deal 与 a great deal of 的区别
1.a great deal:
A:a great deal (n.)名词(这里如有疑问可以去查一下牛津词典)
(1)I have learned a great deal from this book.
我从这本书里学到很多东西。
(2)I have accomplished a great deal in the last few weeks.
在过去几个星期里，我完成了相当多的工作
B: a great deal 还可以修饰形容词或副词的比较级 表示"大量，多"
He sang a great deal better than I. 他唱得比我好多了
(注意：a great deal,a lot,lots 等虽然可以修饰比较级,但是如果形容词的比较级作名词的定语时，只能用much和far 作它的强化语，
而不能用 a great deal, a lot 等去修饰. 例： a far/much harder work.)

2.a great deal of