Could you tell us what happened( )this morning?

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Could you tell us what happened( )this morning?

on

不填

X 不填 this morning 做状语

不填才是正确的

答案in 具体的某一天前用on
morning ,evening 等前用in ,如果是具体的某一天但前面有morning ,evening的话仍然用on. 如on the evening of June 6th
希望采纳O(∩_∩)O谢谢