题目内容：
The two principal criteria for determining promotions are__________.
A．seniority and salary B．knowledge and skills
C．seniority and knowledge
D．merit and seniority
参考答案：
答案解析：
单选题：The two principal criteria for determining promotions are___
- 题目分类：二级专业技能
- 题目类型：单选题
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B．knowledge and skills
C．seniority and knowledge
D．merit and seniority