【題目】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】考查定語從句。句意：隨著國際空間站即將在2024年退休，中國的空間站將提供一個有前途的替代品，到那時中國將是唯一一個擁有永久空間站的國家。由by when（到那時）引導定語從句，故選B。

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