______ scientists develop new ways of feeding the human race, the crowded conditions on earth will make it necessary for us to l

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问题 ______ scientists develop new ways of feeding the human race, the crowded conditions on earth will make it necessary for us to look for open space somewhere else.

选项 A、Until
B、Since
C、Once
D、Even if

答案D

解析 even if“即便；即使”，根据主从句的逻辑关系只能选even if。题句意为：“即使科学家研究出供养人类的新方法，地球上的拥挤情况也会使我们有必要到别的地方去寻找空间。”

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