He watched a group of children ________ (play)football on the playgroundA.to play B.play C.played

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He watched a group of children ________ (play)football on the playgroundA.to play B.play C.played
He watched a group of children ________ (play)football on the playground
A.to play B.play C.played

He watched a group of children ________ (play)football on the playgroundA.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

playing
那用动词原形play
watch sb do/watch sb doing

playing