Aids is said_____ the biggest health challenge to both men and women over the past few years.A.that it is B.to be C.that it has been D.to have been

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Aids is said_____ the biggest health challenge to both men and women over the past few years.A.that it is B.to be C.that it has been D.to have been
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Aids is said_____ the biggest health challenge to both men and women over the past few years.A.that it is B.to be C.that it has been D.to have been
Aids is said_____ the biggest health challenge to both men and women over the past few years.
A.that it is B.to be C.that it has been D.to have been

Aids is said_____ the biggest health challenge to both men and women over the past few years.A.that it is B.to be C.that it has been D.to have been
据说…… 有两种表达法:1 sth is said to be 2 It is said that+从句
又句中有明显的暗示:over the past few years 固定用完成时.所以选D.
C 应该为:It is said that aids has been the biggest health challenge
to both men and women over the past few years.

C
宾语从句,sth. said that +从句

D

3楼的完全正确 选D