(show)_________________the ID. card, the students were allowed to ent-考呗网题库移动版
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解析: Having shown
【译文】出示身份证后,学生们挨个进入考场。   
【考点】非谓语动词
【解析】因为“出示身份证”和“进考场’。是先后两个动作,所以要用分词的完成式作时间状语。

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