实验室中抗血清制备后，抗体特异性鉴定最常采用的方法是（）

A.单向免疫扩散

B.双向免疫扩散

C.免疫电泳

D.亲和层析

E.免疫吸附法

—Where did you meet her?

—It was in a small town        I once worked

A．that

B．where

C．there

D．which