The old man remained seated on the grass with his thoughts the faith that the boy is wort

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A. concentrated in ; adopting
B. focused on ; being adopted
C. attracted to ; to be adopted
(答案→)D. concentrated on ; adopting
解析：考查非谓语动词。第一空为with的复合结构，his thoughts与concentrate之间是被动关系，所以用过去分词，第二空为短语：值得做某事 be worth doing sth,主动表被动，根据语境选D。