_____ that he isn’t adequate to the present job, he devotes all his spare time to studying  professional knowledge.
A．ConcernB．To concernC．ConcernedD．Concerning
C
考查形容詞做狀語，concerned：對…擔(dān)心，關(guān)心，是形容詞做狀語，表示狀態(tài)。句意是：擔(dān)心他不能適合現(xiàn)在的工作，他把所有的時(shí)間都用來學(xué)習(xí)專業(yè)知識。選C。
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