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：對(duì)被動(dòng)語(yǔ)態(tài)的考查。It is said that …的句型可以和be said to do互換，例：It is said that he is a genius。可以轉(zhuǎn)換成He is said to be a genius. 故A、C可以被排除，剩下的B、D兩個(gè)選項(xiàng)主要是時(shí)態(tài)的區(qū)別。如果考生注意到題目中的over the past few years，這一時(shí)間狀語(yǔ)意味著現(xiàn)在完成時(shí)的使用，就不難得出正確選項(xiàng)D。原句就等于It is said that AIDS has been the biggest health challenge to both men and women in that area over the past few years

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