【題目】

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世紀(jì)中葉，絕大多數(shù)的世界人口將居住在城市而不是鄉(xiāng)村。will be living表示將來(lái)這個(gè)時(shí)候人們正在進(jìn)行的動(dòng)作；will have lived表示在這個(gè)時(shí)間之前，這個(gè)live的動(dòng)作已經(jīng)延續(xù)了多久了。因?yàn)槭菍?duì)人們?cè)谖磥?lái)某個(gè)時(shí)間住在哪兒的主觀猜測(cè)，因此用將來(lái)進(jìn)行時(shí)。

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