A new technology combining 5G and facial recognition ______ into use in Beijing Daxing International Airport since Sept

当前位置：高中英语 / 单选题

1. (2021高一上·江门期末) A new technology combining 5G and facial recognition ______ into use in Beijing Daxing International Airport since September 2019.

A . put B . was put C . has put D . has been put

微信扫码预览、分享更方便

使用过本题的试卷

广东省江门市2020-2021学年高一上学期期末调研测试英语试题