【单选题】
The boss realized the importance of qualified staff, and urged all ______to participate in the training seminar.
A.concerning
B.the concerning
C.concerned
D.the concerned
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根据网考网移动考试中心的统计,该试题:
3%的考友选择了A选项
4%的考友选择了B选项
81%的考友选择了C选项
12%的考友选择了D选项