must与must have done 的区别是什么?
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:英语作业 时间:2024/07/09 17:54:08
must与must have done 的区别是什么?
猜测的时态
猜测的时态
![must与must have done 的区别是什么?](/uploads/image/z/7522836-60-6.jpg?t=must%E4%B8%8Emust+have+done+%E7%9A%84%E5%8C%BA%E5%88%AB%E6%98%AF%E4%BB%80%E4%B9%88%3F)
must是必须的意思,must have done是对过去发生的事的肯定推测,表示某事一定发生了
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must have been done must have done
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