这是虚拟语气的倒装形式
1 即为if they had arrived.
2 为 if they were to arrive.
1 条件中用had done 形式,可知是对过去情形的虚拟语气
2 中were to do 是对未来情形的虚拟语气
由题中,the day after tomorrow后天 可知是对未来情况的虚拟语气
所以要用2
对于虚拟语气中各种时态的用法,可参考资料
()before we deaprt the day after tomorrow,we should have a w
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