We are all busy ________ hard for our country.A.work B.to work C.working D.are working

题目

We are all busy ________ hard for our country.A.work B.to work C.working D.are working
帮我翻一下哈 选什么 为什么

答案

答案：C
解释：be busy doing sth 忙于做某事.
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