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
考查连接词。根据主从句的动词时态可知主句谓语动词的动作在从句谓语动词之前已经完成，引导词的意思是：当……的时候，选A。
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