He found them at a table chess.A. sat; to playB. sitting; to playC. seated; playingD. se

问题补充：

He found them at a table chess.

A. sat; to play

B. sitting; to play

C. seated; playing

D. seat; playing

答案：

A. sat; to play

B. sitting; to play

(答案→)C. seated; playing

D. seat; playing

解析：考查宾语补足语和分词做状语。Find sb seated at a table发现某人坐在桌子旁边；seated（就坐）是形容词，playing chess是现在分词短语做伴随状语，因为he与play之间构成主动关系，所以使用现在分词的形式，故C正确。句意：他发现他们坐在桌子旁边在下棋。