Jane had just finished her homework her mom asked her to practice playing the violin yesterday.
A. when
B. while
C. after
D. before
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(答案→)A. when
B. while
C. after
D. before
解析：考查连词：A. when当…时候，表示时间点，这时=at this/that time，B. while当….时候，表示时间段，C. after在…后面，D. before 在….前面，句意：简刚刚完成作业这时妈妈叫她练习钢琴。选A。