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