题目

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：D．  解析：对被动语态的考查。It is said that …的句型可以和be said to do互换，例：It is said that he is a genius。可以转换成He is said to be a genius. 故A、C可以被排除，剩下的B、D两个选项主要是时态的区别。如果考生注意到题目中的over the past few years，这一时间状语意味着现在完成时的使用，就不难得出正确选下列关于发达国家福利制度的叙述，不正确的是A.是由国家进行国民收入再分配的一种形式B.缓解了社会矛盾，稳定了社会秩序C.调动了人们的工作积极性D.扩大了社会消费