By the middle of the 21st century, the vast majority of the world’ s people ______ in cities rather than in rural areas.

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问题 By the middle of the 21st century, the vast majority of the world’ s people ______ in cities rather than in rural areas.

选项 A、are living
B、will be living
C、have lived
D、will have lived

答案D

解析 “by+某个时问点”常与完成时连用,表示到某一时间为止某动作已完成。根据句中的By the middle of the 21st century(到21世纪中期)可知,本句应用将来完成时,表示在将来某一时刻之前已经完成的动作。故选D。
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