By the middle of the 21st century, the vast majority of the world’s population ______ in cities rather than in the country.

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

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

答案B

解析 句意:到二十一世纪中叶,世界上大多数人口将生活在城市而不是农村。因为时间状语by them middle of the 21st century指的是将来,所以选将来进行时。
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