spend ...on(in) doing sth ---------------------------------------------的区别

spend ...on(in) doing sth ---------------------------------------------的区别
spend ...on(in) doing sth ---------------------------------------------的区别

spend ...on(in) doing sth ---------------------------------------------的区别
spend ……on sth
spend ……in doing sth
其实就是一个接名词,一个接动名词形式.

I spent all the evening on my homework.(我花了整个晚上做作业) My mom spent two hours in doing the housework.(我妈用两个小时做家务)