climbed up動(dòng)作發(fā)生在came back 之前
came back 已經(jīng)是過(guò)去時(shí)態(tài)（by the time到...時(shí)候）
過(guò)去完成時(shí)表示“過(guò)去的過(guò)去”
實(shí)際上,多數(shù)用法都有前后動(dòng)作的時(shí)間對(duì)比,或暗含對(duì)比
by the time I came back they had climbed up..
by the time I came back they had climbed up..
by the time I came back they had climbed up ten metres
現(xiàn)在完成時(shí)的結(jié)構(gòu)不是has/have加動(dòng)詞過(guò)去分詞么?為什么不用have climbed?
by the time I came back they had climbed up ten metres
現(xiàn)在完成時(shí)的結(jié)構(gòu)不是has/have加動(dòng)詞過(guò)去分詞么?為什么不用have climbed?
英語(yǔ)人氣：401 ℃時(shí)間：2019-12-11 02:59:45
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