---Do you often see William ________ on the playground?---No, but he is often seen ________ Chinese Kongfu in the park.A.run, playB.run, to playC.running, playD.running, to play
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B解析考查动词。句意为：----你经常看见William在操场上跑步吗？----不，我经常看见他在公园里练中国功夫。“看见”某人做什么事情，动词有两种形式，如果often出现用动词的原形；如果表示动作正在进行就应该用动词的现在分词。在被动语态中原先的动词原形应该变成动词不定式形式。故选B。A和D易选错。