问题描述：
关于when和that的区别
i can not forget the day that we spent together i can not forget the day when we went to the museum 为什么第一句用that而第二句用when呢
i can not forget the day that we spent together i can not forget the day when we went to the museum 为什么第一句用that而第二句用when呢
问题解答：
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