The boy ________ by his father is Tom A beaten B beating
问题描述：
The boy ________ by his father is Tom A beaten B beating
The boy ________ by his father is Tom
A beaten B beating
选A还是B?为什么
答
A
beaten by his father 是过去分词短语做后置定语修饰主语The boy的.
之所以用beaten 而不用beating,是因为beat 和主语The boy 是被动关系,即“挨其父亲打的那位男孩”（是汤姆）
语言点：
及物动词的过去分词表被动； 现在分词表主动