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    精英家教网 > 高中英语 > 题目详情

    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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