题目内容
【题目】With the International Space Station set to retire in 2024,the Chinese space station will offer a promising alternative, China will be the only country with a permanent space station.
A. of which B. by when C. from where D. since when
【答案】B
【解析】考查定语从句。句意:随着国际空间站即将在2024年退休,中国的空间站将提供一个有前途的替代品,到那时中国将是唯一一个拥有永久空间站的国家。由by when(到那时)引导定语从句,故选B。
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