新概念第六课课后习题This flowerpot is broken. Who knocked it over?这里为什么用knocked it over,而不用knocked it off?

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新概念第六课课后习题This flowerpot is broken. Who knocked it over?这里为什么用knocked it over,而不用knocked it off?
新概念第六课课后习题This flowerpot is broken. Who knocked it over?
这里为什么用knocked it over,而不用knocked it off?

新概念第六课课后习题This flowerpot is broken. Who knocked it over?这里为什么用knocked it over,而不用knocked it off?
knock it over 是打翻
knock it off 是打得离开了原来的位置
off指主体物脱离某个接触面.
课文就是强调打翻,估计当时the flowerpot 是打翻在地的,所以这样问.