问题
“That VCD you bought ____ very expensive” . “Do you know ____ ? ”
A:ought to be ; how much it cost
B:may be ; how much it costs
C:must be ; how much it cost
D:can be ; how much doesn''t it cost
B:may be ; how much it costs
C:must be ; how much it cost
D:can be ; how much doesn''t it cost
正确答案是：
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