By the middle of the 21^st century, the vast majority of the world’s population _____ in cities rather than in the country.

By the middle of the 21^st 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

10. By the middle of the 21st century , the vast majority of the world’s population ________ in cities rather than in the country.

By the middle of the 21^st century, the vast majority of the world’s population _____ in cities rather than in the country.

1. A.
   are living
2. B.
   will be living
3. C.
   have lived
4. D.
   will have lived

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