A中cost后缺宾语,改为no matter what it may cost 或no matter how much it may cost
B中however much作it may cost的宾语 ,however除了通常作“然而”讲,作连词,也可做副词,修饰形容词,表示“无论如何,不管怎样”,however much 无论多少
综上.选B
A中cost后缺宾语,改为no matter what it may cost 或no matter how much it may cost
B中however much作it may cost的宾语 ,however除了通常作“然而”讲,作连词,也可做副词,修饰形容词,表示“无论如何,不管怎样”,however much 无论多少
综上.选B