问题
选择题
Although it was not named _____ 1782, this kind of metal was used as early as 5300 BC. [ ]
A. in
B. for
C. until
D. since
答案
答案：C
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Although it was not named _____ 1782, this kind of metal was used as early as 5300 BC. [ ]
A. in
B. for
C. until
D. since
答案：C