【单选题】
The company's training plan was designed to help the employees to improve their work habits and______.
A.proficiency
B.sufficiency
C.insufficiency
D.efficiency
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根据网考网移动考试中心的统计,该试题:
4%的考友选择了A选项
2%的考友选择了B选项
5%的考友选择了C选项
89%的考友选择了D选项