There is no perfect person, some people have made _____success of themselves in spite of what would appear to be ______ weakness in their professions.

A．/, a

B．a, /

C．a, a

D．/, /

以下关于可摘局部义齿基托与天然牙的关系的表述，正确的是

A．基托可进入基牙邻面倒凹区

B．前部基托边缘不应位于舌隆突上

C．基托应与牙面密合，对牙齿有一定的压力

D．基托近龈缘处要做缓冲

E．以上均不正确