问题
选择题
She had just finished her homework ________ her mother asked her to practice playing the piano
yesterday. [ ]
A．when
B．while
C．after
D．since
答案
答案：A
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She had just finished her homework ________ her mother asked her to practice playing the piano
yesterday. [ ]
A．when
B．while
C．after
D．since
答案：A