76.Never before had taxpayers confronted so many changes at once as they had in the Tax Reform Act of 1986.

A.) so many changes at once as they had in

B.)at once as many changes as

C)at once as many changes that there were with

D)as many changes at once as they confronted in

E) so many changes at once that confronted them in

在排除A,B,C后,在D和E之间的选择让我比较犹豫. 原句中"Never"一次表否定的意思,为什么不是用so...as? 

1) 传统用法中，so...as...可以用在否定、疑问、if从句中，不过现代美国英语中用得越来越少，而as ... as...用在肯定、否定、疑问、if从句中都可以接受。