He suddenly returned_____a Sunday morning．A．on B．in C．at D．during

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Hesuddenlyreturned_____aSundaymorning．A．onB．inC．atD．duringHesuddenlyreturned_____aSundaymorning．A．on

He suddenly returned_____a Sunday morning．A．on B．in C．at D．during
He suddenly returned_____a Sunday morning．
A．on B．in C．at D．during

He suddenly returned_____a Sunday morning．A．on B．in C．at D．during
a 在具体某一天的早上用on

B固定搭配，In the morning