To be honest, if it were not for the fact that you ____ my close friend, I would not take such pains

to serve you. [ ]

A. were

B. are

C. had been

D. have been

下面哪一类荧光核型不是抗核抗体的荧光核型（）

A.周边型

B.均质型

C.斑点型

D.核仁型

E.中心型