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Teachers have to constantly update their knowledge in order to maintain their professional ______.
A.consequenceB.independenceC.competenceD.intelligence
C
名词辨析。A结果;B独立;C能力;D智力;结合句意可知C正确。句意:未了维持他们的专业能力,老师需要不停地更新他们的知识。
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