患者男性，59岁，缺失，余留牙均健康
可摘局部义齿修复，基牙应该选择（）
A.
B.
C.
D.
E.
参考答案：D
The girl often helps her mother _____ the housework. [ ]
A. do
B. does
C. doing did
D. did
数据库概念结构的主要设计策略有自顶向下、______、由里向外和混合策略。
缺失，余留牙均健康
缺失，余留牙均健康