My best friend didn't join the Lion. I didn't want to join it, _______. [ ]

A．too

B．also

C．both

D．either

倾斜基牙固定桥取得共同就位道的方法，错误的是（）。

A．正畸

B．备牙

C．改变固位体设计

D．双套冠

E．拔除倾斜牙