问题
选择题
The US was the first country _______ the new strange disease in 1981. [ ]
A. recognized
B. recognizing
C. having recognized
D. to recognize
答案
答案：D
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The US was the first country _______ the new strange disease in 1981. [ ]
A. recognized
B. recognizing
C. having recognized
D. to recognize
答案：D