Buses leave Dorchester Station for St.Marks20 minutes before and after every hour from 6:20am until
问题描述：
Buses leave Dorchester Station for St.Marks20 minutes before and after every hour from 6:20am until
10:40pm.(7 days a week)A bus leaves Dorchester for St.Marks at___on Sundays.A 5:15pm B 4:00pm C 9:40pm D 11:40pm
答
选C 9:40pm
根据题干,每天6：20am到10：40pm间,每个整点差20和过20有一趟车,所以只可能是9:40有车了.