— I rang you at about nine, but there was no reply.

— Oh, that was probably________I was seeing the doctor. [ ]

A. why 

B. when

C. what  

D. that

下列关于嵌顿性疝试行手法复位的指征，错误的是（）

A.婴幼儿嵌顿性斜疝4～6小时以内

B.年老体弱或伴有其他严重疾病，估计无肠坏死者

C.老年妇女的股疝嵌顿

D.病史长而疝块大的斜疝嵌顿

E.嵌顿时间在4小时以内