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AIDS is said _______ the number one killer of both men and w

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AIDS is said _______ the number one killer of both men and women over the past few years in the region.
a.being b.to be
c.to have been d.having been
请说下原因啊谢谢
is said to do是固定结构,over the past few years 是一段时间,需要用完成时,所以选C , 在过去几年里,艾滋病“已经成为”了一号杀手