2. 外语
  3. Grain was the agricultural base for each of the ancient civilizations.

Grain was the agricultural base for each of the ancient civilizations.

admin2012-07-29  59
问题 Grain was the agricultural base for each of the ancient civilizations.
选项 A、many
B、just one
C、several
D、every one
答案D
解析 每一个
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