He asked his father ?A. where it happensB. where did it happenC. how it happenedD. how did

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A. where it happens
B. where did it happen
(答案→)C. how it happened
D. how did it happen
解析：英语宾语从句中一般为陈述语序。句意：他问他的父亲事情是怎么发生的。结合语境可知从句描述的是过去某时发生的动作，故用一般过去时态。故选C。