He found them at a table chess.
A. sat, to play
B. sitting, playing the
C. seated, playing
D. seat, play the
网友回答
A. sat, to play
B. sitting, playing the
(答案→)C. seated, playing
D. seat, play the
解析：考查非谓语动词。句意：他发现他们正坐在一张桌子旁下棋呢。表示“坐着”的状态，用seated或sitting，find sb doing/done发现某人怎么样；排除A、D；棋类和球类前不加the；play chess下棋，故选C。