AIDS is said the biggest health challenge to both men and women in that area ove

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

试题答案

D

考查sb/sth is said to be/do句型。句意：在过去的几年里艾滋病据说已是威胁人们健康的最大挑战，不过是对男人还是女人都是如此。从over the past few years可以判读出应用完成时。