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what has happened to the earth in the last ten years 为什么是完成时

来源：学生作业帮 编辑：神马作文网作业帮 分类：英语作业 时间：2024/11/12 12:47:42
what has happened to the earth in the last ten years 为什么是完成时呢?讲细一点~
what has happened to the earth in the last ten years 为什么是完成时
in the last ten years 是现在完成时的标志.表示从现在起到过去的那时间,因此是一个动作发生在过去,并持续到现在,即动作既涉及到过去,又涉及到现在,因此用现在完成时.
类似的还有：over the last few hours,recently,since +一段时间等等.
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