---Was his father very strict with him when he was at school？
---Yes, he had never praised him _______ he became one of the top students in his gradeA.afterB.unlessC.untilD.when
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C解析never 与until形成搭配。句意：他成为年级中最好的学生时，他父亲表扬了他。从He had never praised him 可以看出父亲表扬过他是事实，所以B项unless（强调条件关系）不合题意。这样说是合情合理的：Yes, he would never praise him unless he could bee one of the top students in his grade