By the middle of the 21st century ,the vast majority of the world's population___in cities.为什么用will be living而不用will have lived

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By the middle of the 21st century ,the vast majority of the world's population___in cities.为什么用will be living而不用will have lived

By the middle of the 21st century ,the vast majority of the world's population___in cities.为什么用will be living而不用will have lived
By the middle of the 21st century ,the vast majority of the world's population___in cities.
为什么用will be living而不用will have lived

By the middle of the 21st century ,the vast majority of the world's population___in cities.为什么用will be living而不用will have lived
LS说的太摸棱两可
will be living这个意思应该是 那些人将会住在城市里(一直住在)
而如果是will have lived则是 那些人到那个时候将会完成住在城市里这个动作(也就是说后来不住在城市里了)

用将来进行时态表示将来正在进行,而不是完成。