问题补充：
– Is this the factoryyou visited last year?
–Yes,it is.
A. where
B. when
C. which
D. who
答案：
A. where
B. when
(答案→)C. which
D. who
解析：本句中先行词the factory为下文定语从句的逻辑宾语，指物，故引导词应用that或者which，结合所给选项，可知选C。
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