The boy is often found in reading books.A. absorbs B. is absorbed C. absorbing D. absorbed

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A. absorbs
B. is absorbed
C. absorbing
(答案→)D. absorbed
解析：考察非谓语动词做宾语补足语，句意：这个男孩经常被发现全神贯注的读书。动词的过去分词做宾语补足语表示被动的已经发生的动作，本句是被动语态，句子的逻辑宾语是主语the boy，故选D。