问题描述：
Six years has passed before I realize it.It was 12 o'clock before I realized it.这两句的区别是什
Six years has passed before I realize it.It was 12 o'clock before I realized it.第一句I realize it第二句I realized it.一个用现在时,一个用过去时,它们的区别是什么啊?
Six years has passed before I realize it.It was 12 o'clock before I realized it.第一句I realize it第二句I realized it.一个用现在时,一个用过去时,它们的区别是什么啊?
问题解答：
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