_______ have you known about table manners?
A To shout B. How many C. How often D. How much
【答案】D
【解析】句意：关于餐桌礼貌你知道多少？how many+可数名词的复数；how often提问频率，过多久一次；how much+不可数名词，对程度进行提问也用how much，这里是对程度提问，故选D
题目：_______ have you known about table manners?
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