By the time I _____the railway station, the train _____.

A．got to, left

B．reached, had left

C．arrived, had left

D．came, left

治疗风寒感冒的药，其服用时间是（）

A.饭前服

B.饭后服

C.睡前服

D.早、中、晚三次服

E.频服，以微汗出为度