问题
选择题
_____ UN report says in 1990 _____ number was over five billion. [ ]
A. The; a
B. An; the
C. A; the
D. A; a
答案
答案：C
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_____ UN report says in 1990 _____ number was over five billion. [ ]
A. The; a
B. An; the
C. A; the
D. A; a
答案：C