Is this factory you visited the other day？A. the oneB. thatC. whereD. when

问题补充：

Is this factory you visited the other day？

A. the one

B. that

C. where

D. when

答案：

(答案→)A. the one

B. that

C. where

D. when

解析：本题可以改为：This factory is you visited the other day. 句中is 后面无表语，后面定语从句也没有先行词，故填入既做表语又做先行词的the one。所以答案为A。