Maybe if I       sicence, and not literature then, I would be able to give you more help.

A．studied

B．would study

C．had studied

D．was studying

可摘局部义齿中，减少义齿力的方法，不包括（）

A．选用塑料牙

B．降低牙尖斜度

C．减小人工牙的颊舌径

D．减少人工牙的咬合接触

E．在游离端义齿修复中可减少人工牙数目