She had just finished her homework her mother asked her to practice playing the piano yesterday. A．when B．while C．after D．since
| A |
| 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。 |