题目内容

AIDS is said_______ the biggest health challenge to both men and women in the earth over the past four years.

A.that it isB.to have beenC.that it has beenD.to be

B

解析试题分析:考查固定句型。sb/sth is said to do sth据说某人/某物做了某事,当两个动作发生有先后关系时,用不定式的完成时,即to have done。句意:在过去的四年里,据说艾滋病已经是威胁男性和女性健康的最大的因素。over/in the past... years“在......过去的几年里”,常与现在完成时连用,关系B。
考点:考查固定句型和时态

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