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。
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