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_____ that he isn’t adequate to the present job, he devotes

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_____ that he isn’t adequate to the present job, he devotes all his spare time to studying  professional knowledge.
A.Concern B.To concern C.Concerned D.Concerning
_____ that he isn’t adequate to the present job, he devotes
C

考查形容词做状语,concerned:对…担心,关心,是形容词做状语,表示状态。句意是:担心他不能适合现在的工作,他把所有的时间都用来学习专业知识。选C。