occur,happen 有什么分别,下题如何选择（为什么）A.I__to be on the spot when the bank robbery___B.The accident___despite all the precautions that had been taken to pevent it

请问occur 和happen有什么区别 英语单词：happen与occur有什么区别? occur,take place,happen,break out有什么区别? occur,happen 有什么分别,下题如何选择（为什么）A.I__to be on the spot when the bank robbery___B.The accident___despite all the precautions that had been taken to pevent it Occur与happen有何区别? occur to和happen to的区别我们常见:It happen to sb.那么,It occur to sb和上面的那句有什么区别呢?请具体给我occur和happen的用法 帮忙辨析几个词组：occur take place happen有什么异同?字典说：occur可以指偶然的事件,happen也可以.晕过去了、 occur happen的区别 occur和happen到底有什么区别啊?老师说sth occur to sb是某人发生了某事,又说it occur to sb是某人突然想到某事,还是分不清, happen 有 sth happen to sb或者sb happen to do sth 那么occur同样的用法吗? occur to /happen toit occur to sb.to do sth ...与it occur to sb that从句..有何区别..it happen to do sth 与it happen to that 从句..有何区别 happen,take place与occur 的区别 occur和happen的差别在哪里 happen与occur的区别是什么? occur与happen的区别是什么? Happen可以有什么时态 occur from 什么意思 occur against什么意思