She had just finished her homework her mother asked her to practice playing the piano yesterday. A．when B．while C．after D．since 题目和参考答案——青夏教育精英家教网—

She had just finished her homework her mother asked her to practice playing the piano yesterday.

A．when

B．while

C．after

D．since

解析试题分析：考查连词：句意：昨天她刚刚做完作业这时妈妈叫她弹钢琴。A. when当…时候，（表示时间点），这时，B. while当…时候，，虽然，然而，C. after在…后面，D. since自从，when可以和过去完成时的句子连用，had done…when…“刚刚做完了…这时…”，选A。
考点：考查连词

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