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

試題分析：考查短語動詞詞義辨識。題意：無故拒絕邀請是不禮貌的。break down：（機械）拋錨；（人的精神）垮掉；settle down：定居；turn down：拒絕；calm down：冷靜下來。故C項正確。
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