单选题
9.
AIDS is said______the No. 1 killer of both men and women over the past few years in that region.
A、
being
B、
to be
C、
to have been
D、
having been
【正确答案】
C
【答案解析】
从时间状语“over the past few years”可知此处要用现在完成时，即be said to havebeen。
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