AIDs is said______the number-one killer of both men and women over the past few

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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. （2002年考试真题）

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

答案 C

解析本题考点为不定式作主语补足语。选用to have done是根据时间状语over the past few years。

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Pheumoniaissaid______thenumber-twokillerofchildrenoverthepastfewyears