题目内容：

____before we leave the day after tomorrow,we shold have a wonderful dinner party .
a were they to arrive b would they arrive
why　no　choice

优质解答

这是将来时的虚拟语气,固定结构为：从句谓语部分用“were to/should+动词原形”,主句谓语部分用“would/should/could/might+动词原形”.
该句子只是一般将来时的虚拟语气的一般疑问句形式.
因为“____before we leave the day after tomorrow”为从句,所以用“were to/should+动词原形”,故选择a.
如果将b选项中的would改为should,那么该答案也是正确的.
对你有所帮助的话,