据说…… 有两种表达法：1 sth is said to be 2 It is said that+从句
又句中有明显的暗示：over the past few years 固定用完成时.所以选D.
C 应该为：It is said that aids has been the biggest health challenge
to both men and women over the past few years.
Aids is said_____ the biggest health challenge to both men a
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