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 |
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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 |