问题补充：
Is this the factory you visited last week?
A. that
B. the one
C. where
D. in which
答案：
(答案→)A. that
B. the one
C. where
D. in which
解析：考查定语从句。句中先行词为the factory，在从句中作宾语，故用关系代词that，选A。
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