—What were you doing when I phoned you last night?

—I      my painting and was starting to take a bath.

A．have already finished

B．was finishing

C．had just finished

D．was going to finish

活化为浆细胞产生抗体的是

A、MΦ

B、T

C、B

D、NK

E、嗜酸性粒细胞