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_____ with the studies of all his students Mr. Johnson went to school as soon as he finished the meeting.

A. Concerning
B. Concerned
C. To concern
D. Being concerned
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科目：高中英語 來源：同步題 題型：單選題

_____ with the studies of all his students Mr. Johnson went to school as soon as he finished the meeting.
[     ]
A. Concerning
B. Concerned
C. To concern
D. Being concerned

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