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havedied与died的区别?例句:iftherewerenowaterintheworld,everything.A.willdieB.woulddieC.wouldhavediedD.wouldhavebeendead请说一下B与C的区别,还有为什么问句中用were,不用was?

题目详情
have died与died的区别?例句:if there were no water in the world, everything___. A.will die B.would die C.would have died D.would have been dead
请说一下B与C的区别,还有为什么问句中用were,不用was?
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答案和解析
首先这是虚拟语气,所以be动词不论前面的主语是什么都用were
have died是表示过去发生的事对现在造成了一定影响,显然这里不是这个意思.