92. 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
答案是D. OG解释说A的错误是had的过去完成时用法不对. 可是so many ... as ... 的用法对吗? | 
