this is the first time 后加什么时态

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• It was the first time in a year and a half that I'd seen the night face to face.主句是一般过去式,从句是过去完成时 主从句所用时态不一致表示什么呢?看见夜晚比“第一次”发生的时间更前?这是一个什么从句呢?
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