问题描述:
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?
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?
问题解答:
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