He found them______at a table______chess.
A.sat, to play
B.sitting, playing the
C.seated, playing
D.seat, play the
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C解析试题分析：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。
考点：考查非谓语动词