一道专四英语题,请高人指点!急!Aids is said _ the number -one killer of both mem and women over the past few years in that region. A.being B.to be C.tn gave been D.having been 请说明选项并解释

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一道专四英语题,请高人指点!急!Aids is said _ the number -one killer of both mem and women over the past few years in that region.                A.being B.to be C.tn gave been D.having been  请说明选项并解释

一道专四英语题,请高人指点!急!Aids is said _ the number -one killer of both mem and women over the past few years in that region. A.being B.to be C.tn gave been D.having been 请说明选项并解释
一道专四英语题,请高人指点!急!
Aids is said _ the number -one killer of both mem and women over the past few years in that region. A.being B.to be C.tn gave been D.having been 请说明选项并解释

一道专四英语题,请高人指点!急!Aids is said _ the number -one killer of both mem and women over the past few years in that region. A.being B.to be C.tn gave been D.having been 请说明选项并解释
sb be said to do sth
sb be believed/known/reported+to do
不定式做主语补足语,是固定用法
也可以使it is said that aids is number -one killer of both mem and women over the past few years in that region.