问题
选择题
She had just finished her homework _____her mother asked her to practice playing the piano yesterday.
A．when
B．while
C．after
D．since
答案
答案：A
考查固定结构。had just done sth when…某人刚刚做了某事，这时。。。句意：昨天她刚写完作业她妈妈就让她练习弹钢琴。选A。