单选题
Every code of etiquette has contained three elements.
A、
practical rules, optional moral duties and formal compliments.
B、
rules, regulations and requirements.
C、
optional moral duties, optional practical rules and artificial graces.
D、
formal compliments, basic moral duties and practical rule.
【正确答案】
D
【答案解析】
[解析] 由文章第2段可推知[D]为正确答案，即“正式的称赞，基本道德责任及实用规则”。其他各项明显与文不符。
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