问题描述：
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.
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.
问题解答：
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