题目

Aids is said_____ the biggest health challenge to both men and women over the past few years.
A.that it is B.to be
C.that it has been D.to have been
选C还是选D啊?时间又是过去..选D

提问时间：2020-08-07

答案

It is said that..或者 主语+ is said to be...这是常用的固定句型,由此,A、C语法上时错误的.再看时间,“over the past few years”,明显是过去已经完成的了,所以选D.
楼上的看清楚,主语是“Aids”,而不是形式主语It...C是错误的