— Do you enjoy your school life?

— Yes, of course. I've had ______ wonderful time here.

A. a

B. an

C. the

咬合创伤的表现不包括

A．牙齿松动

B．X线片显示近牙颈部的牙周膜间隙增宽

C．牙槽骨垂直吸收

D．牙槽骨水平吸收

E．牙松动度重于骨吸收程度