植鞣革上什么油:请教各位英语高手？？

来源：百度文库 编辑：杭州交通信息网 时间：2024/06/05 23:07:46
it is 3 years since his grandma die 和 it is 3 years since his grandma has been dead 这两句话哪句在语法上是正确的？

It has been 3 years since his grandma died.

应该是It has been 3 years since his grandma died.

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