Teachers have to constantly update their knowledge in order to maintain their professional

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A. consequence
B. independence
(答案→)C. petence
D. intelligence
解析：考查名词辨析。句意：为了能保持专业技能，老师们必须不断地更新他们的知识。consequence结果，后果；independence独立，自主；petence能力，技能；intelligence智力，智慧。