混合牙列期的恒牙,充填修复治疗的主要目的是()
A.恢复牙冠解剖外形
B.恢复牙齿高度
C.恢复牙齿邻面触点
D.A+B
E.A+C
参考答案:D
We were all worried over _______ you were sick.
A.that
B.which
C.what
D.the fact that
盆栽植物选择的原则是什么?