Are they going ()a picnic ()asunny morning?AIn;in b on;in c on;on d in;on

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Are they going ()a picnic ()asunny morning?AIn;in b on;in c on;on d in;on
Are they going ()a picnic ()asunny morning?AIn;in b on;in c on;on d in;on

Are they going ()a picnic ()asunny morning?AIn;in b on;in c on;on d in;on
C

C go on 为去做某事,go on a picnic为去野餐;在具体某天的早中晚用介词on