—I thought you wouldn't mind.

—Well, as a matter of fact I________, but you should have asked me first. [ ]

A. did  

B. do  

C. won't  

D. don't

稀土是重要的战略资源，素有“工业味精”的美誉。在氧化钕(Nd₂O₃)等稀土催化剂的作用下可发生反应：4CO+2NO₂ ==N₂+4CO₂，若该反应的反应速率分别用v(CO)、v(NO₂)、v(N₂)、v(CO₂)表示，则下列关系正确的是[ ]

A．                 

B．                

C．               

D．