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5.
M: When did you have your lecture yesterday?
W: It should have begun at 8:15 but it didn't start until Professor Brown came at 8:50.
答案解析：
正确答案为B。对话中提到讲座本应该在8：15开始，但是布朗教授8：50还到，所以讲座8：50才开始。因此正确答案为B。
6.
W: Could you tell me the timetable of the school bus?
M: Well, the bus leaves the campus every two hours starting at 6:30 a.m. But on Saturdays it starts half an hour later.
答案解析：
正确答案为C。根据starting at 6:30 a.m. But on Saturdays it starts half an hour later，可知，平常校车是6：30发车，而周六则会晚半个小时，也就是7：00，因此正确答案为C。
