AIDS is said ________ the number-one killer of both men and women over the past few years in that poverty-stricken region where no medical services are available．

A.being

B.to be

C.to have been

D.having been

答案及解析： C

解析：

试题分析：本题考查对非谓语动词的掌握。详细

解答：由句中的时间状语“over the past few years”可知动作发生在谓语动作之前，故应用不定式的完成式作宾语。