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

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

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

这是一个虚似条件问，因此可以确定用would，用were显然不行的。可以排除A。

因为条件句中省略了if，因此整句要倒装，把would提前，would they arrive。

if they would arrive before we leave the day after tomorrow, we shold have a wonderful dinn...

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这是一个虚似条件问，因此可以确定用would，用were显然不行的。可以排除A。

因为条件句中省略了if，因此整句要倒装，把would提前，would they arrive。

if they would arrive before we leave the day after tomorrow, we shold have a wonderful dinner party .

这样看就会好理解了。

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