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It’s bad manners to keep _______ when your teacher asks you a question.
A.stillB.silentC.quietD.calm
B

试题分析:句意:当你的老师问你一个问题时,保持沉默是不礼貌的。still 静止不动的; silent 沉默的; quiet 安静的;calm 镇静的。keep silent 保持沉默。故选B。
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