新概念3第六课课文Two of his assistants had been working busily since

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新概念3第六课课文
Two of his assistants had been working busily since eight o'clock and had only just finished.这两个动作一个前一个后按照定义应该只有一个用过完啊
After gazing at the display for several minutes,Mr.Taylor went back into his shop.这两个动作一个前一个后怎么只用一般过去式呢

and 并列连词前后形式时态统一
用过完是因为整个故事的背景是过去时,在比过去更早的时间发生的动作,用过完.
只用于单纯讲述过去发生的动作,不强调影响或持续,用过去时就可以了
再问：我的第二个句子我还是不太明白啊亲感觉符合过完的定义
再问：我的第二个句子我还是不太明白啊亲感觉符合过完的定义
再答：因为这里只是单纯的描述他又回到店里啊
用完成式成了，他凝神了几分钟后，已经回到了店里？时间完全错乱啊。
再问：她凝神了几分钟后已经回到店里了也行啊
再答：这个逻辑完全不对啊，他先看，看完进的店
再问：对啊一个前一个后要用过去完成时啊
再答： after后，那个是做状语的，分词啊

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