一道语法题By the time you get to shanghai tomorrow,I_____for chon

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一道语法题By the time you get to shanghai tomorrow,I_____for chongqing.
By the time you get to shanghai tomorrow,I_____for chongqing.
为什么选择shall have left 而不是选择will leave?
希望把知识点说详细是虚拟还是条件还是将来完成时.

因为by the time 的出现意味着使用完成时态而不是一般将来时态,而shall have在整句话中可理解为：当你明天这个时候抵达上海时,我也将在那时已经（shall have）抵达重庆.人已到了而不是will 所表达的“将出发而未到（重庆）”.

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