Never before had taxpayers confronted so many changes at once as they had in the Tax Reform Act og 1986 A,so many changes at once as they had in D,as many changes at once as they confronted in 在考虑这2个选项,我感觉A应该对吧,答案给的是D,但总觉得怪怪的,否定副词再句首的情况不算是否定句吗? 而且根据省略原则来看的话,谓语相同,省略动词保留助动词应该更好点吧,求各位大神指教