—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 grade.
A．a(chǎn)fter B．unless
C．until D．when
C
never 與until形成搭配。句意：他成為年級(jí)中最好的學(xué)生時(shí)，他父親表?yè)P(yáng)了他。從He had never praised him 可以看出父親表?yè)P(yáng)過(guò)他是事實(shí)，所以B項(xiàng)unless（強(qiáng)調(diào)條件關(guān)系）不合題意。這樣說(shuō)是合情合理的：Yes, he would never praise him unless he could become one of the top students in his grade.
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