By the middle of the 21st century, the vast majority of the world’s population _

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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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