____ must have witnessed the robbery.one of the passer-by/on

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____ must have witnessed the robbery.one of the passer-by/one of passers-by选哪个为什么?

第一个,passer-by 意为路人,the passer-by泛指那些路人,one of"其中的一个“
再问： the不是定冠词吗？怎么会泛指呢？ one of之后不是都加复数吗？我觉得one of the passers-by才是正确的呢。。。。
再答： for the people Ϊ��ָô��
再问： Ŷ the��һ��ָ one of֮��Ƕ��Ӹ��
再答： the passer-by泛指”那些“路人,我是这样理解的我复制另一个例句供你参考 none of the passer-by stopped to help the poor man who was lying there ，begging 修正，我同意你的说法，正确的用法是 one of the passers-by

____ must have witnessed the robbery.one of the passer-by/on he must have finished the work by the end of the month,____? Police have repuested that any one who witnessed the acciden The wallet must have been found by one of the villagers.(改为主 The wallet must have been found by one of the villagers改为主动句 Sam was sure that the wallet must have been found by one of We must ___(get) on the bus on the bus one by one.We mustn't no one witnessed the whole process of shooting down the heli 英语翻译The year of 1990 witnessed another steady rise by only 1 the police have caught some of the robbers since the robbery He must have finished the work by himself by the end of last The past twenty years witnessed the fast development of the