2. 外语
  3. Gunpowder was used extensively in firearms prior to 1990.

Gunpowder was used extensively in firearms prior to 1990.

admin2009-06-15  112
问题 Gunpowder was used extensively in firearms prior to 1990.
选项 A、in
B、around
C、from
D、before
答案D
解析
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