A、At 7:30. B、At 8:30. C、At 9:00. D、At 9:30. D时间计算题。首先，校车足从早上7:00开始每隔两小时开一班，星期六早上开车时间晚半个小时，即7:30开车。所以，星期六第二次班车应该是9:30开。

M：The city council has finally voted the funds to build a new high school.
W：It’s about time they did it. I don’t know what took them so long．
Q：What’s the woman’s opinion about the school?

M：Could you tell me the timetable of the school bus?
W：Well，the bus leaves here for the campus every two hours from 7:00a.m.But on Saturdays it starts half an hour later.
Q：When does the second bus leave on Saturdays?