These shoes look very good. I wonder . A. how much cost they are B. how much do they cost

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A. how much cost they are
B. how much do they cost
(答案→)C. how much they cost
D. how much are they cost
解析：wonder后面的从句是疑问句应用陈述语序。即：特殊疑问词+主语+谓语动词。