题目内容：

By then there may be only standing room on the earth.
A where to goB where to livec where to livingDwhere to stand 为什么啊

优质解答

D
By then there may be only standing room on the earth.
=== By then,on the earth there may be only room for you to stand in because there will be many many many many people on this planet.----------- 只有站的地方,没有住的地方.