—Is this gallery ______ you once worked?

—Yes I worked here for three years.[ ]

A. the one that

B. the one where

C. one that

D. one where

测量某个端子或某条线路的电压时，应将万用表的两个表笔与被测的那个端子或那根导线接触，负表笔与电源正极接触。