-Do you have Jay’s CDs?

-sorry,they are ______.But we’ll get some more next week

because they___.

A．sold well;are on sale

B．sold out;sell well

C．selling well;sell well

D．for sale;sell well

关于RPA卡环，下列描述中错误的是（）。

A.常用于远中游离端义齿

B.基牙下存在有软组织倒凹

C.口腔前庭深度不足

D.卡环臂的坚硬部分位于观测线上方

E.卡环臂坚硬部分与观测线上缘接触