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Iamsorrytosaythat(忙于)mywork,ididn'tpayattentionto答案是engagedin,我不怎么怎么理解.

题目详情
I am sorry to say that ______ (忙于) my work,i didn't pay attention to
答案是engaged in,我不怎么怎么理解.
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答案和解析
be engaged in忙于、从事.是固定用法 在这里指say的内容 应是I was engaged in 因为主语都是I am...为避免重复 所以省略I was