Whileincollege,hewasoftenseen____

发布时间：2020-07-26 18:59:28

While in college, he was often seen ________ part-time work in restaurants at the weekends．A.practisingB.to be practisingC.practiseD.to practise

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D解析此句为被动语态，且是经常性动作，所以用不定式to practise作主语补足语。
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