◎ 题干
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
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据魔方格专家分析,试题“AIDS is said________the biggest health challenge to both men and women in that area over thepast few years.[ ]A. that it is B. to beC. that it has been D. t…”主要考查了你对  【不定式的完成式】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。