题目内容

AIDS is said _______ the biggest health challenge to both men and women in that area over the past few years.
A．that it isB．to beC．that it has beenD．to have been
D

试题分析：句意：据说在过去的几年，艾滋病一直是那个地区的男男女女的最大的健康挑战。sth. is said to...是固定结构，所以只能选B或D再因为有时间状语over the past few years.我们必须用动词不定式的完成时。故选D。
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