(show)______the ID. card, the students were allowed to enter the exam-room one by one.

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问题 (show)______the ID. card, the students were allowed to enter the exam-room one by one.

选项

答案Having shown

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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大学英语三级A级

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