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帮忙看下这题为什么用wouldbesaved~Shoulditrain,thecrops.AwouldbesavedBwouldhavebeensavedCwillbesaved请别用排除法···我想知道在这句的虚拟语气中为什么在这用would不用will

题目详情
帮忙看下这题为什么用would be saved~
Should it rain,the crops__.
A would be saved B would have been saved C will be saved
请别用排除法···我想知道在这句的虚拟语气中 为什么在这用would不用will
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答案和解析
对将来情况的虚拟,条件句中谓语动词可用should do,were to do或动词的过去式三种形式表示,主句谓语动词用“would/should/might/could+动词原形”.
主语农作物是被动,所以是be saved