问题补充：
These shoes look very good. I wonder .
A. how much cost they are
B. how much do they cost
C. how much they cost
D. how much are they cost
答案：
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。
