The businessman recently _________(忙于从事)foreign trade． has been engaged in时态：由前面

游客2023-07-30 84

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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