This is the factory we visited last Monday.A. thatB. whereC. in whichD. the one

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(答案→)A. that
B. where
C. in which
D. the one
解析：考查定语从句。本题定语从句的先行词是the factory,定语从句中动词visit后面缺少了宾语，故使用that指代先行词在句中作为visit的宾语。故A正确。