问题补充：
These shoes look very good. I wonder . （上海春季高考题）
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：可联系答.案.网客服索取。
