spend money/time on sth./(in) doing sth

spend money/time on sth./(in) doing sth

spend money/time on sth./(in) doing sth. 在某物/在做某事上花了……时间/金钱

其中in可以省略，通常主语为“人”。例如：

I spent five yuan on this book. 我在这本书上花了五元钱。

I spent two hours (in) doing my homework yesterday. 昨晚我花了两个小时做作业。