问题描述：
He hadn't far when he was knocked () by a big cow and fell down.
into,at,down,over应该填什么?；Now Professor Bumble went on () on the country road.to;for;with;at应该填什么求理由
into,at,down,over应该填什么?；Now Professor Bumble went on () on the country road.to;for;with;at应该填什么求理由
问题解答：
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