occur可指某事情偶然发生或者按照计划进行,在表示具体失去的名词作主语的时候,可与happen换用,但比较正式,跟to短语时,表示“想到”,而不是“发生.
当二者都表示发生的时候happen表示偶然发生.
Did it__to you that you should phone the police.A.happen B.s
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