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
网友回答
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。