One day a rich father took his young son_ a trip to the countryA.in B.for c.at d.on 说明理由

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Onedayarichfathertookhisyoungson_atriptothecountryA.inB.forc.atd.on说明理由Onedayarichfathertookhisyoung

One day a rich father took his young son_ a trip to the countryA.in B.for c.at d.on 说明理由
One day a rich father took his young son_ a trip to the countryA.in B.for c.at d.on 说明理由

One day a rich father took his young son_ a trip to the countryA.in B.for c.at d.on 说明理由
on
on a trip to.是固定搭配,去某地的旅途中

选d
on a trip to...是固定搭配
on a trip to...在去...的途中