spend 时间 on sth.花时间在某事上 =
spend 时间 in doing sth.花时间做某事 ,这个结构里in可以省略
所以一个空格填写:finishing
They spend two hours on their work.保持句意不变 They spend two hours ____their work.
They spend two hours on their work.保持句意不变 They spend two hours ____their work.
英语人气:528 ℃时间:2019-08-20 18:18:36
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