went to the beach a cold morning.A in B at C on D for

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went to the beach a cold morning.A in B at C on D for
went to the beach a cold morning.A in B at C on D for

went to the beach a cold morning.A in B at C on D for
a cold morning是具体时间段,前面加on
选C

C具体到某一天的早晨用on

Con a cold morning具体的某一天用on

A