问题
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
B:how much do they cost
C:how much they cost
D:how much are they cost
正确答案是：
同类题型
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eam finished most of their research work—Yes, but therest rather difficult
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