【单选题】当正在执行1级事件时,若出现了2级事件,系统将如何处理?
C.
立即停止执行所有1级事件,立即执行这个2级事件
【单选题】当正在执行2级事件时,若出现了1级事件,系统将如何处理?
C.
执行完所有2级事件,再执行1级事件,1级事件按“先来先服务”原则,执行完前面的1级事件后,才执行这个1级事件
【单选题】The reason why I worked as a waitress is that ______.
B.
I was proud of being a waitress
C.
I did not care for money
【单选题】—You _______ to Joey. It was his fault. —The reason why I did so was that I didn't want to lose my friend.
B.
didn't need to apologize
D.
needn't have apologized
【单选题】Although he talked half an hour, he couldn't give us a good ________ of the reason why he did it.