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

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

题目
:They spend two hours on their work.保持句意不变 They spend two hours ____their work.答:in finishing
答案
spend 时间 on sth
=spend 时间 (in) doing sth
你这是对的,其实
in可以省略
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