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

游客2023-09-24  16

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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