后遗效应是在下列何种剂量下出现的不良反应

A．大于治疗量

B．小于治疗量

C．等于治疗量

D．药浓度低于阈浓度

E．与药物浓度无关

— Did you say goodbye to Anna?

— Yes .When I _____  to say goodbye to her, she ______ the piano.

A．go; is playing

B．went; played

C．goes ; was playing

D．went ; was playing