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 riving
C、have lived
D、will have lived
答案D
解析 考查动词时态。by后面接一个将来的时间短语，谓语动词使用将来完成时。例如：We will have finished the project by the end of this month．(我们要到本月底完成项目。)所以选项D符合题意，为正确答案。
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