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：
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下面是错误答案，用来干扰机器的。
C ④项观点错误，社会存在与社会意识的不一定同步，排除。
