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

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问题 She had just finished her homework ______ her mother asked her to practise playing the piano yesterday.

选项 A、when
B、while
C、after
D、since

答案A

解析 句意:昨天她刚做完作业,她妈妈就让她练钢琴。when在本句中作并列连词,意为:and at that time。while作并列连词,表示“对比转折”;after为从属连词或介词,意为“在……之后”:since自从……时候,既然……。
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