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knock on;knock at;knock over;knock

来源：学生作业帮 编辑：搜搜考试网作业帮 分类：英语作业 时间：2024/07/11 09:48:33
knock on;knock at;knock over;knock
knock on;knock at;knock over;knock
knock on/at指敲门.介词2个都可以
knock over,撞倒
the car knocked the boy over
最后一个不知道．我就只知道怎么多了,帮不了你多少
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