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

試題分析：考查固定句型。sb/sth is said to do sth據(jù)說某人/某物做了某事，當兩個動作發(fā)生有先后關(guān)系時，用不定式的完成時，即to have done。句意：在過去的四年里，據(jù)說艾滋病已經(jīng)是威脅男性和女性健康的最大的因素。over/in the past... years“在......過去的幾年里”，常與現(xiàn)在完成時連用，關(guān)系B。
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