they arrived ( ) a Tuesday morning 括号内用 in 还是 on 原因

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theyarrived()aTuesdaymorning括号内用in还是on原因theyarrived()aTuesdaymorning括号内用in还是on原因theyarrived()aTuesda

they arrived ( ) a Tuesday morning 括号内用 in 还是 on 原因
they arrived ( ) a Tuesday morning 括号内用 in 还是 on 原因

they arrived ( ) a Tuesday morning 括号内用 in 还是 on 原因
on .
表示具体某一天的早晨或晚上要用on.

on
具体某一天用on

on 具体到了天