in his letter was his promise that he would spend the Christmas Eve with me为什么用that?

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in his letter was his promise that he would spend the Christmas Eve with me为什么用that?
in his letter was his promise that he would spend the Christmas Eve with me
为什么用that?

in his letter was his promise that he would spend the Christmas Eve with me为什么用that?
宾语从句

虚拟语气

宾语从句，his promise was that……