常导致休克，且休克不易纠正的外科急腹症是（）。

A.机械性肠梗阻

B.消化性溃疡急性穿孔

C.急性化脓性阑尾炎穿孔

D.急性胰腺炎

E.急性梗阻性化脓性胆管炎

The factory _____ I visited yesterday was not the one _____ I once worked. [ ]

A. which; where

B. which; which

C. where; where

D. where; which