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

試題分析：句意:當(dāng)你的老師問你一個問題時，保持沉默是不禮貌的。still 靜止不動的； silent 沉默的； quiet 安靜的；calm 鎮(zhèn)靜的。keep silent 保持沉默。故選B。
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