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