I often see Tom on the playground. When I passed the playground yesterday, I saw him A.play; playingB.to play; playC.playing; to playD.playing; play
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A解析看某人做某事表示状态或情况用see sb do sth，我经常看到汤姆在操场上玩，指的是一件事，而不是动作，故第一个空用play，后句当我经过操场的时候，看到他在玩应该正在玩，故用see sb doing sth，故选A