— What sort of car do you want to have?  An expensive one?   

— Well,it _____ be expensive-that's not important.   [ ]

A. mustn't                          

B. needn't    

C. can't                            

D. won't

截面为矩形，非合金钢经电镀法加工而成的平板镀锌铁皮(规格：750*1500mm，厚度1mm)