有关happened的科普精选

happen和happened的区别
happen就是“发生”的原型,是个不及物动词。常用词组有:happentodosth;ithappensthat;sthhappenstobe。happened是happen的过去式。happening除了刚才说的名词含义之外,what'shappening?表示“发生了什么事”。...
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