_new books have been given away since then A many of B a gre

a many of the students
一、many后直接修饰名词,名词可以有修饰语,如:
many students
many young students
二、a many of后主要接：
1.代词：a many of them
2.受冠词修饰的名词：a many of the students
3.受these,those修饰的名词：a many of these students
4.受物主代词修饰的名词：a many of my students
5.受所有格修饰的名词：a many of Tom's students

答案选B a great many of 许多；大量
A不正确，应该没有of 才可以直接可数名词，表示许多，大量