【题目】Jane had just finished her homework ________ her mom asked her to practice playing the violin yesterday.
A. when B. while
C. after D. before
在线课程【答案】A
【解析】A当...时（可以和短暂性动词也可以和延续性动词连用）；B while当...时（与延续性动词连用）;C 在...后；D在...之前；句意：昨天当她妈妈让她拉小提琴的时候，Jane刚刚完成她的家庭作业。句中的ask是一个短暂性动词，和when连用。故A正确。