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

A. when B. while C. after D. since

 

A

【解析】考查時間狀語從句的連接詞。此處when就在這時。句意：昨天她剛剛完成作業(yè)這時她的母親就讓她練琴。

 

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