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

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(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。