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：主要测试宾语从句。从语境考虑：句子中动词wonder和cost均需要宾语，还应该注意宾语从句的语序应该用陈述句语序，综上所述答案就可以一目了然。句子意思：这些鞋子看起来非常好看。我想它们价值无论多少均可以。
