Every evening after dinner, if not in reading books, she can be found on the sofa watchi

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A. absorbed; seating
B. absorbing; sat
(答案→)C. absorbed; seated
D. absorbing; sitting
解析：
If引导条件状语从句，如果主从主语一直，并从句中谓语动词有be动词时，可省略if从句中的be动词和主语。sb be absorbed in doing sth,某人全神贯注地做某事。第二空seat是及物动词，构成seat sb结构，现在sb前置了，故用被动形式。故选C