John usually spends 3 hours to do his homework eve

问题补充：

John usually spends 3 hours to do his homework every day.改错

答案：

John usually spends 3 hours doing his homework every day.

spend...doing...花费...做...

固定搭配======以下答案可供参考======

供参考答案1:

to do 改为doing

spend some time (in) doing sth.