---Do you know the timetable of the school bus?
---Sure, the first trip at 6:30 a.m. and usually continues until 4 p.m. on weekdays.
A. will start
B. starts
C. is starting
D. started
网友回答
A. will start
(答案→)B. starts
C. is starting
D. started
解析：考查时态题。陈述时间表应用一般现在时，故答案为B。