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that he isn’t adequate to the present job, he devotes all his spare time to stud

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that he isn’t adequate to the present job, he devotes all his spare time to stud

________ 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

试题答案

答案:C