业务性事故是指因旅游服务部门运行机制出现故障造成的事故。可分为( )。
A. 轻微事故
B. 一般事故
C. 严重事故
D. 自然事故
E. 责任事故
It was finding Jane______enabled him to break out of his depression.
A. which
B. when
C. it
D. that
He______taking a little walk when he saw the boy fall into the river.
A. happened to be
B. happened to
C. was happening
D. happened
The peasants wanted to______with the businessman for some salt.
A. quarrel
B. barter
C. ask
D. change