This flowerpot is broken.Who knocked it ___?

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This flowerpot is broken.Who knocked it ___?
根据上下文填上正确的介词或副词.
答案是over.那么off也可以吗?

当knock off和knock over同时在表示“撞倒”意思的时候,knock over一般就是指撞倒（+ed被动）,比如说A boy was knocked over by a passing car but was fortunately unhurt.而knock off则指从某个地方（被）撞倒,如A boy was knocked off his bike by a passing car but was fortunately unhurt

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