They spend two hours on their work.保持句意不变 They spend two hou

They spend two hours on their work.保持句意不变 They spend two hours ____their work.

qiuhsty 1年前已收到3个回答举报

sifeifei 春芽

共回答了14个问题采纳率：92.9% 举报

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

1年前

彗星0411 幼苗

共回答了1个问题举报

fishing

1年前

JASONSHANGHAI 幼苗

共回答了183个问题举报

in finishing

1年前

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你能帮帮他们吗

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