last和keep有什么区别?

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/10 12:43:30

last和keep有什么区别?
如 the dentist said it was time to fill up the hole with some material which would _____ long
填的是last,而为什么keep不可以呢?

last 持续keep 保持
只能用last

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