She had just finished her homework her mother asked her to practise playing the piano yes

问题补充：

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

A. when

B. while

C. after

D. since

答案：

(答案→)A. when

B. while

C. after

D. since

解析：可联系答.案.网客服索取。