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）
A、
being
B、
to be
C、
to have been
D、
having been
【正确答案】
C
【答案解析】
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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