Mr. Zhang once taught in a remote village in Anhui province as a volunteer, was accessible only on foot.
A. where
B. which
C. that
D. what
网友回答
A. where
(答案→)B. which
C. that
D. what
解析：句意：张老师曾经作为一名志愿者，在安徽省一个偏远的村子教学，那个学校（交通不便，）只有步行才能到达。此处which引导非限制性定语从句。故选B。