The second Sunday in May is a day ____ we show our thanks to our motherA on which B at which C which D in which
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ThesecondSundayinMayisaday____weshowourthankstoourmotherAonwhichBatwhichCwhichDinwhichThesecondSunda
The second Sunday in May is a day ____ we show our thanks to our motherA on which B at which C which D in which
The second Sunday in May is a day ____ we show our thanks to our mother
A on which B at which C which D in which
The second Sunday in May is a day ____ we show our thanks to our motherA on which B at which C which D in which
A 具体到某一天的介词用ON,
A