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【题目】

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

A. are living

B. will be living

C. have lived

D. will have lived

【答案】B

【解析】句意:到21世纪中叶,绝大多数的世界人口将居住在城市而不是乡村。will be living表示将来这个时候人们正在进行的动作;will have lived表示在这个时间之前,这个live的动作已经延续了多久了。因为是对人们在未来某个时间住在哪儿的主观猜测,因此用将来进行时。

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