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It is bad manners to ________an invitation without a reason.
A.break downB.settle downC.turn downD.calm down
C

试题分析:考查短语动词词义辨识。题意:无故拒绝邀请是不礼貌的。break down:(机械)抛锚;(人的精神)垮掉;settle down:定居;turn down:拒绝;calm down:冷静下来。故C项正确。
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