自动发卡机如何完成车队处理（）？
A、点击鼠标右键菜单
B、转换人工发卡
C、选择键盘功能键
D、推杆放行
参考答案：A, C
It was about 600 years ago ________ the first clock with a face and an hour hand was made. [ ]
A. that
B. until
C. before
D. when
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