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During this time, the passengers were told to keep calm until the plane had disembarked这句until后面的从句为什么用过去完成时
网校学员ur4**在学习新概念英语2、3、4册连读【双11专享班】时提出了此问题，已有1人帮助了TA。
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同学你好，该知识点来自沪江网校《新概念英语2、3、4册连读【双11专享班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。
同学你好~在until, as soon as等时间状语从句中，可以用完成时，强调一个动作的完成。
这里用过去完成时强调在这个动作完成之后，也就是大家要一直保持镇定，直到飞机完成降落。
祝同学学习进步~
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新概念英语2、3、4册连读【双11专享班】
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