2. 外语
  3. Three hundred years ago people were (debate) ______whether the earth or the sun was the center of the universe.

Three hundred years ago people were (debate) ______whether the earth or the sun was the center of the universe.

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问题 Three hundred years ago people were (debate) ______whether the earth or the sun was the center of the universe.
选项
答案debating
解析 本题表示过去某个时间某事正在进行，所以应该用过去进行时。
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