19．The academic performance of her students has proved that her professional competence as a teacher is unquestionable．

分析 她學生們的學術表現(xiàn)證明了她作為老師的專業(yè)能力是無可置疑的．

解答 答案：competence 考查首字母填空．根據(jù)句意及句子結構，要填入名詞，competence意為"能力；勝任，稱職"，在句中作主語．

點評 考查首字母填空．準確地翻譯句子、理解句子，然后根據(jù)句意及提示完成句子，使句意更通順．

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