问题: 英语
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
答案是D
解答:
解析：be said后接不定式，根据题中的时间状语over the past few years，表明不定式的的动作谓语动作之前。
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