AIDS is said to have been the biggestALDS is said to have been the biggest health challenge to both men and women in that area over the past few years.为什么用to have been?

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AIDSissaidtohavebeenthebiggestALDSissaidtohavebeenthebiggesthealthchallengetobothmenandwomeninthatar

AIDS is said to have been the biggestALDS is said to have been the biggest health challenge to both men and women in that area over the past few years.为什么用to have been?
AIDS is said to have been the biggest
ALDS is said to have been the biggest health challenge to both men and women in that area over the past few years.为什么用to have been?

AIDS is said to have been the biggestALDS is said to have been the biggest health challenge to both men and women in that area over the past few years.为什么用to have been?
过去几年来,艾滋病一直被认为是那个地区对男人和女人最大的健康挑战.is said to be是个短语.被认为、被称作是.have been 是完成时,因为后面用了“over”

to have done 结构 是不定式完成时， 表示发生在谓语动词前
sb. is said 后面跟to do 结构
比如：Bell is said to have invented the telephone. 据说贝尔发明了电话。

艾滋病据说是过去几年那个领域对男女最大的挑战。
to have done表示发生在谓语动词（这里是is said)之前的动作。

近几年来，据说AIDS已在当地成为男女健康问题的最大挑战。

AIDS is said to have been the biggestALDS is said to have been the biggest health challenge to both men and women in that area over the past few years.为什么用to have been? 英语翻译AIDS is said____the number-one killer of both men and women over the past few years inthat region.A.beingB.to beC.to have beenD.having been在said附近有没有语法现象?为什么用完成时态? AIDS is said _______ the number one killer of both men and women over the past few years in the region.a.being b.to be c.to have been d.having been 请说下原因啊谢谢 AIDS is said to( have been)the biggest challenge to human over the past few year括号中的have been,语法书上说用完成时是指过去发生的事情,并且对现在有影响时才用,这句里的AIDS不是在上几年才发生的吗?对现在 Doctor Friedland said the study also shows there is no reason to punish AIDS patients and to force You said to have forgotten?Is He is said to have been there It is said ( )more than 68000 people have died of AIDS in China this year.A.which B./ C.that D.what AIDS is said ___________  the biggest health challenge to both men and women in that area over the past few years.A  that  it  is     B to be  C  that it has been   D  to have been 1 AIDS is said----the number-one killer of both men and women over the past few years in the region.A being B to be C to have been D having been2 The popularity of the film shows that the reviewers' fears were completely------.A unjustified B unjust The book is said to have been translated into several languages.is said是什么成分? Bob is said to have studied abroad 改成 it is said that Bob _______ 怎么改 为什么 It is said that he came.=He is said to have come. 有没有is said to have been doing的结构 “He is said to have gone abroad”翻译成中文! that women is said to have married with the left 在He is said to have studied ehglish . There ______ no life on the moon.A.is said to have B.are said to have C.is said to be D.areThere ______ no life on the moon.A.is said to have B.are said to have C.is said to be D.are said to be