作业帮英语 第四题 为什么选D would have known而不选b或c?
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英语 第四题 为什么选D would have known而不选b或c?
【考查的是虚拟语气的用法】主句与从句的动作发生在不同的时间,这时主从句谓语动词的虚拟语气形式因时间不同而不同,这叫做混合条件句.
如：If you had asked him yesterday,you would know what to do now.（从句与过去事实相反,主句与现在事实相反.）
If it had rained last night (过去),it would be very cold today (现在).
如：If you had asked him yesterday,you would know what to do now.（从句与过去事实相反,主句与现在事实相反.）
If it had rained last night (过去),it would be very cold today (现在).