— It’s ten years since I met you last time. I ________ you at all.

—I wouldn’t have, either, if someone ________ you by name.

A．didn’t recognize; didn’t call

B．haven’t recognized; didn’t call

C．can’t recognize; had called

D．didn’t recognize; hadn’t called

免疫球蛋白的型及亚型分类依据是免疫球蛋白（）

A.VH抗原性的不同

B.VL抗原性的不同

C.CL抗原性的不同

D.CH抗原性的不同

E.CV抗原性的不同