It was Sunday .It was ten o'clock at night ,and the last bus had just stopped at the gate of a park .An old woman _____, and the conductor was going to ring the bell for the driver to start the bus again , when he saw a boy crying at the bus stop ."What is the matter ?" the bus conductor said to the bus .空格處的備選項有got on got off ,老師,參考答案是got off ,為什么不是上車got on 呢?還有,第二句話中為什么用過去完成時呢?不是用一般過去時就可以了嗎?