:They spend two hours on their work.保持句意不变 They spend two hours ____their work.答:in finishing

问题描述:

:They spend two hours on their work.保持句意不变 They spend two hours ____their work.答:in finishing

我觉得可以用with 代替 on

不对
这句话的意思是他们花了两小时工作,并没有说一定完成
根据短语spend time doing something
所以我觉得填doing 更合适

spend 时间 on sth
=spend 时间 (in) doing sth
你这是对的,其实
in可以省略