问题补充：
Is this the factory you visited last year?
A. the one
B. where
C. that
D. which
答案：
(答案→)A. the one
B. where
C. that
D. which
解析：
this如是主语，factory前要有定冠词，这样可选C、D。但这里是the factory，所以只能选A。
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