题文
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 |
推荐试卷
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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