－ Did you go to the party yesterday?

－ Yes. It was ______ fun evening. We all had ______ great fun at the party.

A．a; ／

B．a; a

C．／;／

D．／: the

关于上颌中切牙，正确的是（）

A.单根、断面为扁形

B.腭侧较唇侧牙槽骨壁薄

C.拔牙时不用旋转力

D.牙根弯向近中

E.拔除时最好沿前下方向牵引脱位