by the time I came back they had climbed up..
by the time I came back they had climbed up ten metres
现在完成时的结构不是has/have加动词过去分词么?为什么不用have climbed?
人气：215 ℃ 时间：2019-12-11 02:59:45
解答
climbed up动作发生在came back 之前
came back 已经是过去时态（by the time到...时候）
过去完成时表示“过去的过去”
实际上,多数用法都有前后动作的时间对比,或暗含对比
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