【一道专四英语题,请高人指点!急!Aidsissaid_thenumber-onekillerofbothmemandwomenoverthepastfewyearsinthatregion.A.beingB.tobeC.tngavebeenD.havingbeen请说明选项并解释】

问题：【一道专四英语题,请高人指点!急!Aidsissaid_thenumber-onekillerofbothmemandwomenoverthepastfewyearsinthatregion.A.beingB.tobeC.tngavebeenD.havingbeen请说明选项并解释】

答案：↓↓↓

姜海鹏的回答：

网友采纳　　sbbesaidtodosth　　sbbebelieved/known/reported+todo　　不定式做主语补足语,是固定用法　　也可以使itissaidthataidsisnumber-onekillerofbothmemandwomenoverthepastfewyearsinthatregion.