:They spend two hours on their work.保持句意不变 They spend two hours __英语解答

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

人气：492 ℃　时间：2019-12-06 02:53:19

解答

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