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He watched a group of children ________ (play)football on th

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He watched a group of children ________ (play)football on the playground
A.to play B.play C.played
playing
watch sb.doing sth.看某人正在做某事
那就:play
watch sb.do sth.看某人做某事
再问: A. to play B. play C. played 没有playing
再答: B 理由见上面
再问: C.为什么不对
再答: watch 后跟动词原形啊,不要过去式啊