牙本质龋脱矿层形成的原因是

A．成牙本质细胞突变性所致
B．细菌侵入的结果
C．细菌和酸共同作用
D．细菌进入前，酸作用的结果
E．蛋白酶作用

If you _______ my advice, you _______ your failure now．You _______ your victory．

A．took ．．．wouldn’t cry over ．．．would celebrate

B．had taken ．．．wouldn’t have cried over ．．．would have celebrated

C．had taken ．．．aren’t crying over ．．．are celebrating

D．had taken ．．．wouldn’t be crying over ．．．would be celebrating