题目内容

_____ 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。
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