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

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 语法结构题。本句的关键点是：时间状语by the middle of the 21st century指的是将来，而live(居住)是延续性动词，故应用将来进行时，强调将来时刻的一种状况。而D 项是表示动作的完成，不符题意。本句的意思是：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。
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