---Do you know the timetable of the school bus?-Sure the first trip at 6:30 a.m. and u

问题补充：

---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

答案：

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。