_____ 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 -高中英语-n多题

◎ 题干

_____ 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

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◎ 解析

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◎ 知识点

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