We get up at 8:30 ____ the morning of Sundays.A.on B.in

We get up at 8:30 ____ the morning of Sundays.A.on B.in
We get up at 8:30 ____ the morning of Sundays.A.on B.in

We get up at 8:30 ____ the morning of Sundays.A.on B.in
A
【on】 the morning of Sundays
当出现特指某一天早晨,下午或者晚上的时候,都要用介词on
比如：on the afternoon of Mondays

A
具体到某一天或某一天的早上/下午/晚上用ON
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We get up at 8:30 __on__ the morning of Sundays.