2. 外语
  3. The businessman recently _________(忙于从事)foreign trade．

The businessman recently _________(忙于从事)foreign trade．

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问题 The businessman recently _________(忙于从事)foreign trade．
选项
答案has been engaged in
解析 时态：由前面的recently决定此处应使用现在完成时。词组：be engaged in(从事于，忙碌于)
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大学英语四级

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