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4.The American ping-pong team _______________ (beat) by the

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4.The American ping-pong team _______________ (beat) by the Chinese team in yesterday's match.
5.\x09Don't let children who aren't old enough ________________ (swim) in this river.
8._____________ (lose) two tickets to the football games made Tom very unhappy.请说明理由
4.The American ping-pong team _______________ (beat) by the
1 beat
2 swim
3 Losing
再问: 为什么
再答: beat 击败,动词原形与过去式、过去分词保持不变;
swim用在let之后,就不能加动词不定式的标志词to了;
losing是动名词,只有动名词才可以做句子的主语,单纯的动词是不可以的。