2. 专升本
  3. Unlike sound, light can travel in a vacuum, in empty space_____there is not even air.

Unlike sound, light can travel in a vacuum, in empty space_____there is not even air.

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问题 Unlike sound, light can travel in a vacuum, in empty space_____there is not even air.
选项 A、where
B、that
C、when
D、as
答案A
解析
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