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

 

句型sb. /sth. is said to+不定式，當(dāng)不定式動作表示完成時，不定式需用完成形式，本題需用被動形式，因此選D項。

 

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