题目内容
AIDS is said__________the biggest health to people in that area over the past few years.
A.that is B.to be C.that it has been D.to have been
D

练习册系列答案
相关题目
题目内容
AIDS is said__________the biggest health to people in that area over the past few years.
A.that is B.to be C.that it has been D.to have been
D