赶快的反义词是什么呢:every hour on the half hour是什么意思?

来源:百度文库 编辑:神马品牌网 时间:2024/05/13 15:25:50
这是95年的高考阅读题,“buses going to the town center will leave the main hall every hour on the half hour during the day”
Question:at which of the following times will the bus leave the main hall?
A 8:00 9:00 10:00 11:00
B 8:00 9:00 10:30 11:30
C 8:30 9:00 9:30 10:00
D 8:00 9:30 11:00 12:30
我想知道"every hour on the half hour"是什么意思,还有就是这道题选什么,谢谢!