Need an good explanation on this:
Never before had taxpayers confronted so many changes at once as they had in the Tax Reform Act of 1986.
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
A is definitely out due to the use of past perfect tense which is not correct here.
C is out coz wrong idiom as ...that
E the same to C.
In B, I doubt the position of "at once " right after the verb " confronted" .
Feel nothing wrong with D so I go for it.