AIDS is said_____the number-one killer of both men and women over the past few y

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问题 AIDS is said_____the number-one killer of both men and women over the past few years in that region.

选项 A、being
B、to be
C、to have been
D、having been

答案 C

解析不定式用法题。be said to be表示“据说(目前)是”；由于本句的时间状语为over thepast few years，所以要求这里的不定式要使用完成式，因为不定式完成式表示过去已经发生的事，be said to have been表示“据说(过去或已经)是”，因此本题应该选[C]。

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