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

試題分析：句意：據(jù)說在過去的幾年，艾滋病一直是那個地區(qū)的男男女女的最大的健康挑戰(zhàn)。sth. is said to...是固定結(jié)構(gòu)，所以只能選B或D再因為有時間狀語over the past few years.我們必須用動詞不定式的完成時。故選D。
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