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 |
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