问题
选择题
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
答案
答案：D
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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
答案：D