看了近10篇的讨论,gwd24-20,仍有一问

24-20 According to a 1996 survey by the National Association of College an University Business Officers, more than three times as many independent institutions of higher education charge tuition and fees of under $8,000 a year than those that charge over $16,000.

A) than those that charge

B) than are charging

C) than to charge

D) as charge

E) as those charging

大家都在DE之间争论。

我想问的是，开头的by the National Association of College an University Business Officers 这句话我怎么看不明白，另外有人能给直译一下原题目吗？先谢谢了！

According to a 1996 survey by the National Association of College (and) University Business Officers,

I am pretty sure that someone just typed the word wrong.