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She had just finished her homework her mother asked her to p

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She had just finished her homework her mother asked her to practice playing the piano yesterday.
She had just finished her homework her mother asked her to practice playing the piano yesterday.A.whenB.while C.afterD.since
请问C为什么不对,
A
前面的主句用的是过去完成时态,也就是含有“过去的过去”这个概念,说明finish在ask之前发送,如果换成after,那就应该是:She finished her homework after her mother had just asked her to practice playing the piano yesterday.