-Mike, why did you make no reply to me when I called your name in the street just now?

-Sorry, Tom. I_______ to my mother on the phone.

A．am talking

B．was talking

C．talked

D．had talked

饮酒后出现上消化道出血可选用（）

A.凝血酶

B.奥美拉唑

C.氨甲环酸

D.生长抑素

E.巴曲酶