新概念3第六课课文Two of his assistants had been working busily since
1个回答
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
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