10. 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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10. 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 |