AIDS is said _______ the biggest health challenge to both men and women in that area over the past few years.

A．that it is

B．to be

C．that it has been

D．to have been

批准减缴、免缴、缓缴排污费的排污者名单由受理申请的环境保护行政主管部门会同同级财政部门、审计主管部门予以公告，公告应当注明批准减缴、免缴、缓缴排污费的主要理由。