she said that she___her homework before supper.A finished B had finished C has finished D finishes为什么选B呢?

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she said that she___her homework before supper.
A finished B had finished C has finished D finishes
为什么选B呢?

因为句子本来是过去时
但作业完成是在她说之前就完成了
所以是过去的过去 用过去完成时