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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

D

解析试题分析: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。
考点:考查句子结构以及动词不定式的时态。

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