The director thought I was referring to her in fact I was referring to the men on duty.A.

问题补充：

The director thought I was referring to her,in fact, I was referring to the men on duty.

A. when

B. where

C. which

D. while

答案：

A. when

B. where

C. which

(答案→)D. while

解析：考查连词。句子前后表转折关系，所以用while，然而，表前后对比。选D。