2. 专升本
  3. A body,______it is in motion, would never stop itself if there were no friction.

A body,______it is in motion, would never stop itself if there were no friction.

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问题 A body,______it is in motion, would never stop itself if there were no friction.
选项 A、till
B、when
C、before
D、once
答案D
解析
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