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i did not hear \ i have not heard \ i have not been hearing

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/10/06 16:38:27
i did not hear \ i have not heard \ i have not been hearing 它们有什么区别啊?
这是时态的问题
i did not hear 是过去时,表示过去没有听到过,i have not heard 是现在完成时,表示从过去某时间到现在都没听到,i have not been hearing 是完成进行时,表示从过去某时刻到现在都在持续的动作.